{"id":33654,"date":"2019-11-18T14:26:43","date_gmt":"2019-11-18T17:26:43","guid":{"rendered":"https:\/\/blog.estrategiavestibulares.com.br\/?p=33654"},"modified":"2021-06-23T10:16:35","modified_gmt":"2021-06-23T13:16:35","slug":"prova-unicamp-2020-matematica","status":"publish","type":"post","link":"https:\/\/vestibulares.estrategia.com\/portal\/materias\/matematica\/prova-unicamp-2020-matematica\/","title":{"rendered":"Prova Unicamp 2020 \u2013 Matem\u00e1tica \u2013 Resolu\u00e7\u00e3o Comentada"},"content":{"rendered":"<p>Ol&aacute;, pessoal&hellip; Tudo bem? Sou a prof. Mar&ccedil;al, do Estrat&eacute;gia Vestibulares, e escrevo este artigo para lan&ccedil;ar o Gabarito UNICAMP 2020, da disciplina de <a href=\"https:\/\/vestibulares.estrategia.com\/portal\/category\/matematica\/\" target=\"_blank\">Matem&aacute;tica<\/a>. Nesta p&aacute;gina, voc&ecirc; vai conferir a resolu&ccedil;&atilde;o comentada completa. Vamos nessa??<div class=\"wp-block-file\">\"&gt;Prova UNICAMP 2020 &ndash; Matem&aacute;tica &ndash; Corre&ccedil;&atilde;o\" class=\"wp-block-file__button\" download&gt;Baixar<\/div><h2 class=\"wp-block-heading\">Prova <a href=\"https:\/\/vestibulares.estrategia.com\/portal\/vestibulares\/vestibular-unicamp\/\" target=\"_blank\">UNICAMP 2020<\/a><\/h2><h3 class=\"wp-block-heading\"><strong>Quest&atilde;o 80<\/strong><\/h3><p>&ldquo;(&hellip;) as palavras tomam significados distintos\ndaqueles utilizados no cotidiano. Por exemplo, utiliza-se, com frequ&ecirc;ncia, nas\naulas sobre fra&ccedil;&otilde;es, a frase reduzir ao mesmo denominador.&rdquo;<\/p><p>(Edi Jussara\nC&acirc;ndido Lorensatti, Linguagem matem&aacute;tica e L&iacute;ngua Portuguesa: di&aacute;logo<\/p><p>necess&aacute;rio na\nresolu&ccedil;&atilde;o de problemas matem&aacute;ticos. Conjectura: Filosofia e Educa&ccedil;&atilde;o<\/p><p>Caxias do Sul,\nv. 14, n. 2, p. 91, maio\/ago. 2009.)<\/p><p>Cada ci&ecirc;ncia usa uma linguagem pr&oacute;pria e com um grau\nde precis&atilde;o terminol&oacute;gica necess&aacute;rio para o seu exerc&iacute;cio. Tendo em vista os\nsignificados distintos que as palavras assumem nas situa&ccedil;&otilde;es concretas em que\ns&atilde;o empregadas, o verbo &ldquo;reduzir&rdquo;, no uso cotidiano, significa<\/p><p>a) limitar alguma coisa, ao passo que na linguagem\nmatem&aacute;tica &eacute; sin&ocirc;nimo de restringir.<\/p><p>b) moderar alguma coisa, ao passo que na linguagem\nmatem&aacute;tica implica aumentar as rela&ccedil;&otilde;es entre os n&uacute;meros.<\/p><p>c) eliminar alguma coisa, ao passo que na linguagem\nmatem&aacute;tica implica reverter as rela&ccedil;&otilde;es entre os n&uacute;meros.<\/p><p>d) diminuir alguma coisa, ao passo que na linguagem\nmatem&aacute;tica &eacute; sin&ocirc;nimo de converter.<\/p><h3 class=\"wp-block-heading\"><strong>Resolu&ccedil;&atilde;o Comentada<\/strong><\/h3><p><em>No cotidiano, reduzir significa diminuir. No contexto matem&aacute;tico das fra&ccedil;&otilde;es, pode ser entendido com reescrever uma fra&ccedil;&atilde;o, ou seja, convert&ecirc;-la em outro formato.<\/em><\/p><p class=\"has-light-green-cyan-background-color has-background\">Gabarito: d)<\/p><h3 class=\"wp-block-heading\">Quest&atilde;o 32<\/h3><p>Em uma fam&iacute;lia, cada filha tem o mesmo\nn&uacute;mero de irm&atilde;s e irm&atilde;os, e cada filho tem um n&uacute;mero de irm&atilde;s igual ao dobro do\nn&uacute;mero de irm&atilde;os. O n&uacute;mero total de filhos e filhas dessa fam&iacute;lia &eacute; igual a<\/p><p>a) 11.<\/p><p>b) 9.<\/p><p>c) 7.<\/p><p>d) 5.<\/p><h3 class=\"wp-block-heading\"><strong>Resolu&ccedil;&atilde;o Comentada<\/strong><\/h3><p>Para uma filha, podemos dizer que o n&uacute;mero de irm&atilde;s, sendo <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;A\" alt=\"\\dpi{100} \\large A\" align=\"absmiddle\"> o n&uacute;mero de filhas, &eacute; dado por <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;A-1\" alt=\"\\dpi{100} \\large A-1\" align=\"absmiddle\">, pois uma filha n&atilde;o &eacute; considerada irm&atilde; de si mesma. J&aacute; o n&uacute;mero de irm&atilde;os de uma filha, sendo <em>O<\/em> o n&uacute;mero de filhos, &eacute; dado por <em>O<\/em> mesmo.<\/p><p>J&aacute; para um filho, o n&uacute;mero de irm&atilde;os &eacute; igual a <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;O-1\" alt=\"\\dpi{100} \\large O-1\" align=\"absmiddle\"> pelo mesmo motivo citado anteriormente. O n&uacute;mero de irm&atilde;s de um filho &eacute; igual a <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;A\" alt=\"\\dpi{100} \\large A\" align=\"absmiddle\">.<\/p><p>Dessa forma, pelo enunciado, podemos montar o seguinte sistema de equa&ccedil;&otilde;es:<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Cleft%5C%7B%5Cbegin%7Bmatrix%7DA-1=O%5C%5C%5C&amp;space;%5C%5C2%5Ccdot%5Cleft(O-1%5Cright)=A%5C%5C%5Cend%7Bmatrix%7D%5Cright.%5Crightarrow%5Cleft%5C%7B%5Cbegin%7Bmatrix%7DA-1=O%5C%5C%5C&amp;space;%5C%5C2%5Ccdot&amp;space;O-2=A%5C%5C%5Cend%7Bmatrix%7D%5Cright.%5Crightarrow\" alt=\"\\dpi{100} \\left\\{\\begin{matrix}A-1=O\\\\\\ \\\\2\\cdot\\left(O-1\\right)=A\\\\\\end{matrix}\\right.\\rightarrow\\left\\{\\begin{matrix}A-1=O\\\\\\ \\\\2\\cdot O-2=A\\\\\\end{matrix}\\right.\\rightarrow\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Cleft%5C%7B%5Cbegin%7Bmatrix%7DA-O=1%5C%5C%5C&amp;space;%5C%5C-A+2%5Ccdot&amp;space;O=2%5C%5C%5Cend%7Bmatrix%7D%5Cright.%5Crightarrow%5Cleft%5C%7B%5Cbegin%7Bmatrix%7DA-O=1%5C%5C%5C&amp;space;%5C%5CO=3%5C%5C%5Cend%7Bmatrix%7D%5Cright.%5Crightarrow%5Cleft%5C%7B%5Cbegin%7Bmatrix%7DA=4%5C%5C%5C&amp;space;%5C%5CO=3%5C%5C%5Cend%7Bmatrix%7D%5Cright.\" alt=\"\\dpi{100} \\left\\{\\begin{matrix}A-O=1\\\\\\ \\\\-A+2\\cdot O=2\\\\\\end{matrix}\\right.\\rightarrow\\left\\{\\begin{matrix}A-O=1\\\\\\ \\\\O=3\\\\\\end{matrix}\\right.\\rightarrow\\left\\{\\begin{matrix}A=4\\\\\\ \\\\O=3\\\\\\end{matrix}\\right.\" align=\"absmiddle\"><\/p><p>De posse do n&uacute;mero de filhos <em>O<\/em> e de filhas <em>A<\/em>, a soma &eacute; dada por:<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;A+O=4+3=7\" alt=\"\\dpi{100} A+O=4+3=7\" align=\"absmiddle\"><\/p><p class=\"has-light-green-cyan-background-color has-background\"><strong>Gabarito: C<\/strong><\/p><h3 class=\"wp-block-heading\"><strong>Quest&atilde;o 33<\/strong><\/h3><p>Cinco pessoas devem ficar em p&eacute;, uma ao\nlado da outra, para tirar uma fotografia, sendo que duas delas se recusam a\nficar lado a lado. O n&uacute;mero de posi&ccedil;&otilde;es distintas para as cinco pessoas serem\nfotografadas juntas &eacute; igual a<\/p><p>a) 48.<\/p><p>b) 72.<\/p><p>c) 96.<\/p><p>d) 120.<\/p><h3 class=\"wp-block-heading\"><strong>Resolu&ccedil;&atilde;o Comentada<\/strong><\/h3><p>Se n&atilde;o houvesse restri&ccedil;&atilde;o, o n&uacute;mero de maneiras de colocarmos cinco pessoas em linha &eacute; dado por:<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;P_5=5!=5%5Ccdot&amp;space;4%5Ccdot&amp;space;3%5Ccdot&amp;space;2%5Ccdot&amp;space;1\" alt=\"\\dpi{100} \\large P_5=5!=5\\cdot 4\\cdot 3\\cdot 2\\cdot 1\" align=\"absmiddle\"><\/p><p>Considerando as duas pessoas &ldquo;engui&ccedil;adas&rdquo; como uma s&oacute; (modo proibido), temos:<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;2%5Ccdot&amp;space;P_4=2%5Ccdot&amp;space;4%5Ccdot&amp;space;3%5Ccdot&amp;space;2%5Ccdot&amp;space;1\" alt=\"\\dpi{100} \\large 2\\cdot P_4=2\\cdot 4\\cdot 3\\cdot 2\\cdot 1\" align=\"absmiddle\"><\/p><p>Dessa maneira, o n&uacute;mero de modos permitidos para enfileirarmos essas pessoas, de modo que as duas que se recusam a ficar lado a lado n&atilde;o sejam contrariadas, &eacute; dado pela diferen&ccedil;a:<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;5%5Ccdot4%5Ccdot3%5Ccdot2%5Ccdot1-2%5Ccdot4%5Ccdot3%5Ccdot2%5Ccdot1\" alt=\"\\dpi{100} \\large 5\\cdot4\\cdot3\\cdot2\\cdot1-2\\cdot4\\cdot3\\cdot2\\cdot1\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;3%5Ccdot4%5Ccdot3%5Ccdot2%5Ccdot1%5C%5C\" alt=\"\\dpi{100} \\large 3\\cdot4\\cdot3\\cdot2\\cdot1\\\\\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;72\" alt=\"\\dpi{100} \\large 72\" align=\"absmiddle\"><\/p><p class=\"has-light-green-cyan-background-color has-background\"><strong>Gabarito: B<\/strong><\/p><h3 class=\"wp-block-heading\"><strong>Quest&atilde;o 34<\/strong><\/h3><p>Um atleta participa de um torneio composto por tr&ecirc;s\nprovas. Em cada prova, a probabilidade de ele ganhar &eacute; de 2\/3,\nindependentemente do resultado das outras provas.<\/p><p>Para vencer o torneio, &eacute; preciso ganhar pelo menos\nduas provas. A probabilidade de o atleta vencer o torneio &eacute; igual a<\/p><p>a) 2\/3.<\/p><p>b) 4\/9.<\/p><p>c) 20\/27.<\/p><p>d) 16\/81.<\/p><h3 class=\"wp-block-heading\"><strong>Resolu&ccedil;&atilde;o Comentada<\/strong><\/h3><p>Considerando <em>V<\/em> a situa&ccedil;&atilde;o em que o atleta vence e <em>P<\/em> a situa&ccedil;&atilde;o em que o atleta perde uma prova, temos que, para vender o torneio, dever&aacute; ocorrer uma das seguintes situa&ccedil;&otilde;es:<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;VVV\" alt=\"\\dpi{100} \\large VVV\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;VVP\" alt=\"\\dpi{100} \\large VVP\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;VPV\" alt=\"\\dpi{100} \\large VPV\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;PVV\" alt=\"\\dpi{100} \\large PVV\" align=\"absmiddle\"><\/p><p>Como as situa&ccedil;&otilde;es agrupadas s&atilde;o alternativas, ou seja, deve ocorrer uma OU outra, a probabilidade &eacute; dada pela soma:<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;%5Cfrac%7B2%7D%7B3%7D%5Ccdot%5Cfrac%7B2%7D%7B3%7D%5Ccdot%5Cfrac%7B2%7D%7B3%7D+%5Cfrac%7B2%7D%7B3%7D%5Ccdot%5Cfrac%7B2%7D%7B3%7D%5Ccdot%5Cfrac%7B1%7D%7B3%7D+%5Cfrac%7B2%7D%7B3%7D%5Ccdot%5Cfrac%7B1%7D%7B3%7D%5Ccdot%5Cfrac%7B2%7D%7B3%7D+%5Cfrac%7B1%7D%7B3%7D%5Ccdot%5Cfrac%7B2%7D%7B3%7D%5Ccdot%5Cfrac%7B2%7D%7B3%7D\" alt=\"\\dpi{100} \\large \\frac{2}{3}\\cdot\\frac{2}{3}\\cdot\\frac{2}{3}+\\frac{2}{3}\\cdot\\frac{2}{3}\\cdot\\frac{1}{3}+\\frac{2}{3}\\cdot\\frac{1}{3}\\cdot\\frac{2}{3}+\\frac{1}{3}\\cdot\\frac{2}{3}\\cdot\\frac{2}{3}\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;%5Cfrac%7B8%7D%7B27%7D+3%5Ccdot%5Cfrac%7B4%7D%7B27%7D\" alt=\"\\dpi{100} \\large \\frac{8}{27}+3\\cdot\\frac{4}{27}\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;%5Cfrac%7B20%7D%7B27%7D\" alt=\"\\dpi{100} \\large \\frac{20}{27}\" align=\"absmiddle\"><\/p><p class=\"has-light-green-cyan-background-color has-background\"><strong>Gabarito: C<\/strong><\/p><h3 class=\"wp-block-heading\"><strong>Quest&atilde;o 35<\/strong><\/h3><p>Sabendo que <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;a\" alt=\"\\dpi{100} \\large a\" align=\"absmiddle\"> &eacute; um n&uacute;mero real, considere a fun&ccedil;&atilde;o <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;f%5Cleft(x%5Cright)=ax+2\" alt=\"\\dpi{100} \\large f\\left(x\\right)=ax+2\" align=\"absmiddle\">, definida para todo n&uacute;mero real <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;x\" alt=\"\\dpi{100} \\large x\" align=\"absmiddle\">. Se <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;f%5Cleft(f%5Cleft(1%5Cright)%5Cright)=1\" alt=\"\\dpi{100} \\large f\\left(f\\left(1\\right)\\right)=1\" align=\"absmiddle\">, ent&atilde;o:<\/p><p>a) <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;a=-1\" alt=\"\\dpi{100} \\large a=-1\" align=\"absmiddle\"><\/p><p>b) <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;a=-%5Cfrac%7B1%7D%7B2%7D\" alt=\"\\dpi{100} \\large a=-\\frac{1}{2}\" align=\"absmiddle\"><\/p><p>c) <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;a=%5Cfrac%7B1%7D%7B2%7D\" alt=\"\\dpi{100} \\large a=\\frac{1}{2}\" align=\"absmiddle\"><\/p><p>d)&nbsp;<img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;a=1\" alt=\"\\dpi{100} \\large a=1\" align=\"absmiddle\"><\/p><h3 class=\"wp-block-heading\">Resolu&ccedil;&atilde;o Comentada<\/h3><p>Como a quest&atilde;o pediu uma fun&ccedil;&atilde;o composta envolvendo <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;f(1)\" alt=\"\\dpi{100} \\large f(1)\" align=\"absmiddle\">, vamos adiantar nosso trabalho e calcular <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;f(1)\" alt=\"\\dpi{100} \\large f(1)\" align=\"absmiddle\">.<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;f%5Cleft(x%5Cright)=ax+2\" alt=\"\\dpi{100} \\large f\\left(x\\right)=ax+2\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;f%5Cleft(1%5Cright)=a%5Ccdot1+2\" alt=\"\\dpi{100} \\large f\\left(1\\right)=a\\cdot1+2\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;f%5Cleft(1%5Cright)=a+2\" alt=\"\\dpi{100} \\large f\\left(1\\right)=a+2\" align=\"absmiddle\"><\/p><p>Se posse de <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;f(1)\" alt=\"\\dpi{100} \\large f(1)\" align=\"absmiddle\">, vamos substitui-la na equa&ccedil;&atilde;o <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;f%5Cleft(f%5Cleft(1%5Cright)%5Cright)=1\" alt=\"\\dpi{100} \\large f\\left(f\\left(1\\right)\\right)=1\" align=\"absmiddle\"> dada no enunciado.<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;f%5Cleft(x%5Cright)=ax+2\" alt=\"\\dpi{100} \\large f\\left(x\\right)=ax+2\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;f%5Cleft(f%5Cleft(1%5Cright)%5Cright)=a%5Ccdot&amp;space;f%5Cleft(1%5Cright)+2\" alt=\"\\dpi{100} \\large f\\left(f\\left(1\\right)\\right)=a\\cdot f\\left(1\\right)+2\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;1=a%5Ccdot(a+2)+2\" alt=\"\\dpi{100} \\large 1=a\\cdot(a+2)+2\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;1=a%5E2+2a+2\" alt=\"\\dpi{100} \\large 1=a^2+2a+2\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;0=a%5E2+2a+1\" alt=\"\\dpi{100} \\large 0=a^2+2a+1\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;0=%5Cleft(a+1%5Cright)%5E2\" alt=\"\\dpi{100} \\large 0=\\left(a+1\\right)^2\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;a=-1\" alt=\"\\dpi{100} \\large a=-1\" align=\"absmiddle\"><\/p><p class=\"has-light-green-cyan-background-color has-background\"><strong>Gabarito: A<\/strong><\/p><h3 class=\"wp-block-heading\"><strong>Quest&atilde;o 36<\/strong><\/h3><p>Sabendo que <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;a\" alt=\"\\dpi{100} \\large a\" align=\"absmiddle\"> &eacute; um n&uacute;mero real, considere a equa&ccedil;&atilde;o quadr&aacute;tica <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;2x%5E2+ax+10=0\" alt=\"\\dpi{100} \\large 2x^2+ax+10=0\" align=\"absmiddle\">. Se as solu&ccedil;&otilde;es dessa equa&ccedil;&atilde;o s&atilde;o n&uacute;meros inteiros, o m&oacute;dulo da soma das solu&ccedil;&otilde;es &eacute; igual a<\/p><p>a) 3.<\/p><p>b) 4.<\/p><p>c) 5.<\/p><p>d) 6.<\/p><h3 class=\"wp-block-heading\"><strong>Resolu&ccedil;&atilde;o Comentada<\/strong><\/h3><p>Dada a equa&ccedil;&atilde;o<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;2x%5E2+ax+10=0\" alt=\"\\dpi{100} \\large 2x^2+ax+10=0\" align=\"absmiddle\"><\/p><p>Temos, pelas rela&ccedil;&otilde;es de Girard:<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;%5Cleft%5C%7B%5Cbegin%7Bmatrix%7Dx%5E%5Cprime+x%5E%7B%5Cprime%5Cprime%7D=-%5Cfrac%7Ba%7D%7B2%7D%5C%5C%5C&amp;space;%5C%5Cx%5E%5Cprime%5Ccdot&amp;space;x%5E%7B%5Cprime%5Cprime%7D=%5Cfrac%7B10%7D%7B2%7D=5%5C%5C%5Cend%7Bmatrix%7D%5Cright.\" alt=\"\\dpi{100} \\large \\left\\{\\begin{matrix}x^\\prime+x^{\\prime\\prime}=-\\frac{a}{2}\\\\\\ \\\\x^\\prime\\cdot x^{\\prime\\prime}=\\frac{10}{2}=5\\\\\\end{matrix}\\right.\" align=\"absmiddle\"><\/p><p>Para que o produto de dois n&uacute;meros inteiros, <em>x&rdquo;<\/em> e <em>x&rdquo;<\/em>,seja igual a 5, temos apenas duas op&ccedil;&otilde;es:<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;%5Cleft%5C%7B%5Cbegin%7Bmatrix%7Dx%5E%5Cprime=1%5C%5C%5C&amp;space;%5C%5Cx%5E%7B%5Cprime%5Cprime%7D=5%5C%5C%5Cend%7Bmatrix%7D%5Cright.\" alt=\"\\dpi{100} \\large \\left\\{\\begin{matrix}x^\\prime=1\\\\\\ \\\\x^{\\prime\\prime}=5\\\\\\end{matrix}\\right.\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;%5Cleft%5C%7B%5Cbegin%7Bmatrix%7Dx%5E%5Cprime=-1%5C%5C%5C&amp;space;%5C%5Cx%5E%7B%5Cprime%5Cprime%7D=-5%5C%5C%5Cend%7Bmatrix%7D%5Cright.\" alt=\"\\dpi{100} \\large \\left\\{\\begin{matrix}x^\\prime=-1\\\\\\ \\\\x^{\\prime\\prime}=-5\\\\\\end{matrix}\\right.\" align=\"absmiddle\"><\/p><p>De todo modo, temos:<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;%5Cleft%7Cx%5E%5Cprime+x%5E%7B%5Cprime%5Cprime%7D%5Cright%7C=6\" alt=\"\\dpi{100} \\large \\left|x^\\prime+x^{\\prime\\prime}\\right|=6\" align=\"absmiddle\"><\/p><p class=\"has-light-green-cyan-background-color has-background\"><strong>Gabarito: D<\/strong><\/p><h3 class=\"wp-block-heading\"><strong>Quest&atilde;o 37<\/strong><\/h3><p>Considere que (a, b, 3, c) &eacute; uma progress&atilde;o aritm&eacute;tica de n&uacute;meros reais, e que a soma de seus elementos &eacute; igual a 8. O produto dos elementos dessa progress&atilde;o &eacute; igual a<\/p><p>a) 30.<\/p><p>b) 10.<\/p><p>c) -15.<\/p><p>d) -20.<\/p><h3 class=\"wp-block-heading\"><strong>Resolu&ccedil;&atilde;o Comentada<\/strong><\/h3><p>Para reduzir o n&uacute;mero de inc&oacute;gnitas, vamos reescrever a progress&atilde;o com base na raz&atilde;o <em>r<\/em>.<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;(a,b,3,c)\" alt=\"\\dpi{100} \\large (a,b,3,c)\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Cdpi%7B100%7D&amp;space;%5Clarge&amp;space;(3-2r,3-r,3,3+r)\" alt=\"\\dpi{100} \\large (3-2r,3-r,3,3+r)\" align=\"absmiddle\"><\/p><p>O enunciado informou que a soma dos elementos da progress&atilde;o &eacute; igual a 8, ent&atilde;o, vamos escrever e resolver essa equa&ccedil;&atilde;o.<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;3-2r+3-r+3+3+r=8\" alt=\"\\large 3-2r+3-r+3+3+r=8\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;3-2r+3-r+3+3+r=8\" alt=\"\\large 3-2r+3-r+3+3+r=8\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;12-2r=8\" alt=\"\\large 12-2r=8\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;4=2r\" alt=\"\\large 4=2r\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;2=r\" alt=\"\\large 2=r\" align=\"absmiddle\"><\/p><p>De posse da raz&atilde;o, podemos estabelecer quais s&atilde;o os elementos da progress&atilde;o:<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;(3-2r,3-r,3,3+r)\" alt=\"\\large (3-2r,3-r,3,3+r)\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;(3-2%5Ccdot2,3-2,3,3+2)\" alt=\"\\large (3-2\\cdot2,3-2,3,3+2)\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;(-1,1,3,5)\" alt=\"\\large (-1,1,3,5)\" align=\"absmiddle\"><\/p><p>Como nossa quest&atilde;o pede o produto dos elementos, temos:<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Cleft(-1%5Cright)%5Ccdot%5Cleft(1%5Cright)%5Ccdot%5Cleft(3%5Cright)%5Ccdot%5Cleft(5%5Cright)=-15\" alt=\"\\large \\left(-1\\right)\\cdot\\left(1\\right)\\cdot\\left(3\\right)\\cdot\\left(5\\right)=-15\" align=\"absmiddle\"><\/p><p class=\"has-light-green-cyan-background-color has-background\"><strong>Gabarito: C<\/strong><\/p><h3 class=\"wp-block-heading\"><strong>Quest&atilde;o 38<\/strong><\/h3><p>Tendo em vista que <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;a\" alt=\"\\large a\" align=\"absmiddle\"> e <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;b\" alt=\"\\large b\" align=\"absmiddle\"> s&atilde;o n&uacute;meros reais positivos, <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;a%5Cneq&amp;space;b\" alt=\"\\large a\\neq b\" align=\"absmiddle\">, considere a fun&ccedil;&atilde;o <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;f%5Cleft(x%5Cright)=ab%5Ex\" alt=\"\\large f\\left(x\\right)=ab^x\" align=\"absmiddle\">, definida para todo n&uacute;mero real <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;x\" alt=\"\\large x\" align=\"absmiddle\">. Logo, <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;f(2)\" alt=\"\\large f(2)\" align=\"absmiddle\"> &eacute; igual a:<\/p><p>a) <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Csqrt%7Bf%5Cleft(1%5Cright)f(3)%7D\" alt=\"\\large \\sqrt{f\\left(1\\right)f(3)}\" align=\"absmiddle\"><\/p><p>b) <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;f(3)\/f(2)\" alt=\"\\large f(3)\/f(2)\" align=\"absmiddle\"><\/p><p>c) <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;f%5Cleft(0%5Cright)f(1)\" alt=\"\\large f\\left(0\\right)f(1)\" align=\"absmiddle\"><\/p><p>d) <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;f%5Cleft(0%5Cright)%5E3\" alt=\"\\large f\\left(0\\right)^3\" align=\"absmiddle\"><\/p><h3 class=\"wp-block-heading\"><strong>Resolu&ccedil;&atilde;o Comentada<\/strong><\/h3><p>O exerc&iacute;cio n&atilde;o d&aacute; uma dire&ccedil;&atilde;o espec&iacute;fica no enunciado, ent&atilde;o, &eacute; interessante olhar para as alternativas para entender qual &eacute; o tipo de resposta esperada.<\/p><p>Ao perceber que todas apresentam <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;f(x)\" alt=\"\\large f(x)\" align=\"absmiddle\"> para <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;x=0,1,2,3\" alt=\"\\large x=0,1,2,3\" align=\"absmiddle\">; vamos come&ccedil;ar por calcular esses valores.<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;f(0)=a\" alt=\"\\large f(0)=a\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;f(1)=ab\" alt=\"\\large f(1)=ab\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;f(2)=ab%5E%7B2%7D\" alt=\"\\large f(2)=ab^{2}\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;f(3)=ab%5E%7B3%7D\" alt=\"\\large f(3)=ab^{3}\" align=\"absmiddle\"><\/p><p>Perceba que <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;f(3)\" alt=\"\\large f(3)\" align=\"absmiddle\"> pode ser reescrito em fun&ccedil;&atilde;o de <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;f(2)\" alt=\"\\large f(2)\" align=\"absmiddle\">.<\/p><p>Muito bem, falta o termo&nbsp;<em>b<\/em>. Podemos reescrever a equa&ccedil;&atilde;o acima como:<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;f(3)=f(2)%5Ccdot%5Cfrac%7Bf(2)%7D%7Bf(1)%7D\" alt=\"\\large f(3)=f(2)\\cdot\\frac{f(2)}{f(1)}\" align=\"absmiddle\"><\/p><p>Como a quest&atilde;o pede a express&atilde;o equivalente a <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;f(2)\" alt=\"\\large f(2)\" align=\"absmiddle\">, temos:<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;f(3)=%5Cfrac%7B%5Cleft%5Bf%5Cleft(2%5Cright)%5Cright%5D%5E2%7D%7Bf(1)%7D\" alt=\"\\large f(3)=\\frac{\\left[f\\left(2\\right)\\right]^2}{f(1)}\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;f%5Cleft(3%5Cright)%5Ccdot&amp;space;f(1)=%5Cleft%5Bf%5Cleft(2%5Cright)%5Cright%5D%5E2\" alt=\"\\large f\\left(3\\right)\\cdot f(1)=\\left[f\\left(2\\right)\\right]^2\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Csqrt%7Bf%5Cleft(3%5Cright)%5Ccdot&amp;space;f(1)%7D=f%5Cleft(2%5Cright)\" alt=\"\\large \\sqrt{f\\left(3\\right)\\cdot f(1)}=f\\left(2\\right)\" align=\"absmiddle\"><\/p><p class=\"has-light-green-cyan-background-color has-background\"><strong>Gabarito: A<\/strong><\/p><h3 class=\"wp-block-heading\"><strong>Quest&atilde;o 39<\/strong><\/h3><p>Sabendo que <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;p\" alt=\"\\large p\" align=\"absmiddle\"> &eacute; um n&uacute;mero real, considere a matriz<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;A=%5Cleft%5B%5Cbegin%7Bmatrix%7Dp&amp;2%5C%5C0&amp;p%5C%5C%5Cend%7Bmatrix%7D%5Cright%5D\" alt=\"\\large A=\\left[\\begin{matrix}p&amp;2\\\\0&amp;p\\\\\\end{matrix}\\right]\" align=\"absmiddle\"><\/p><p>e sua transposta <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;A%5E%7BT%7D\" alt=\"\\large A^{T}\" align=\"absmiddle\">. Se <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;A+A%5ET\" alt=\"\\large A+A^T\" align=\"absmiddle\"> singular (n&atilde;o invert&iacute;vel), ent&atilde;o:<\/p><p>a) <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;p=0\" alt=\"\\large p=0\" align=\"absmiddle\"><\/p><p>b) <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Cleft&amp;space;%7C&amp;space;p&amp;space;%5Cright&amp;space;%7C=1\" alt=\"\\large \\left | p \\right |=1\" align=\"absmiddle\"><\/p><p>c) <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Cleft&amp;space;%7C&amp;space;p&amp;space;%5Cright&amp;space;%7C=2\" alt=\"\\large \\left | p \\right |=2\" align=\"absmiddle\"><\/p><p>d) <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;p=3\" alt=\"\\large p=3\" align=\"absmiddle\"><\/p><h3 class=\"wp-block-heading\"><strong>Resolu&ccedil;&atilde;o Comentada<\/strong><\/h3><p>O enunciado nos informa que <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;A+A%5ET\" alt=\"\\large A+A^T\" align=\"absmiddle\"> &eacute; singular. Ent&atilde;o, vamos calcular <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;A+A%5ET\" alt=\"\\large A+A^T\" align=\"absmiddle\">.<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;A=%5Cleft%5B%5Cbegin%7Bmatrix%7Dp&amp;2%5C%5C0&amp;p%5C%5C%5Cend%7Bmatrix%7D%5Cright%5D\" alt=\"\\large A=\\left[\\begin{matrix}p&amp;2\\\\0&amp;p\\\\\\end{matrix}\\right]\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;A%5ET=%5Cleft%5B%5Cbegin%7Bmatrix%7Dp&amp;0%5C%5C2&amp;p%5C%5C%5Cend%7Bmatrix%7D%5Cright%5D\" alt=\"\\large A^T=\\left[\\begin{matrix}p&amp;0\\\\2&amp;p\\\\\\end{matrix}\\right]\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;A+A%5ET=%5Cleft%5B%5Cbegin%7Bmatrix%7Dp&amp;2%5C%5C0&amp;p%5C%5C%5Cend%7Bmatrix%7D%5Cright%5D+%5Cleft%5B%5Cbegin%7Bmatrix%7Dp&amp;0%5C%5C2&amp;p%5C%5C%5Cend%7Bmatrix%7D%5Cright%5D\" alt=\"\\large A+A^T=\\left[\\begin{matrix}p&amp;2\\\\0&amp;p\\\\\\end{matrix}\\right]+\\left[\\begin{matrix}p&amp;0\\\\2&amp;p\\\\\\end{matrix}\\right]\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;A+A%5ET=%5Cleft%5B%5Cbegin%7Bmatrix%7D2p&amp;2%5C%5C2&amp;2p%5C%5C%5Cend%7Bmatrix%7D%5Cright%5D\" alt=\"\\large A+A^T=\\left[\\begin{matrix}2p&amp;2\\\\2&amp;2p\\\\\\end{matrix}\\right]\" align=\"absmiddle\"><\/p><p>Como <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Cleft(A+A%5ET%5Cright)\" alt=\"\\large \\left(A+A^T\\right)\" align=\"absmiddle\"> &eacute; singular, temos que seu determinante &eacute; nulo.<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Cdet%7B%5Cleft(A+A%5ET%5Cright)%7D=0\" alt=\"\\large \\det{\\left(A+A^T\\right)}=0\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Cleft%7C%5Cbegin%7Bmatrix%7D2p&amp;2%5C%5C2&amp;2p%5C%5C%5Cend%7Bmatrix%7D%5Cright%7C=0\" alt=\"\\large \\left|\\begin{matrix}2p&amp;2\\\\2&amp;2p\\\\\\end{matrix}\\right|=0\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;4p%5E2-4=0\" alt=\"\\large 4p^2-4=0\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;4p%5E2=4\" alt=\"\\large 4p^2=4\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;p%5E2=1\" alt=\"\\large p^2=1\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Csqrt%7Bp%5E2%7D=%5Csqrt1\" alt=\"\\large \\sqrt{p^2}=\\sqrt1\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Cleft%7Cp%5Cright%7C=1\" alt=\"\\large \\left|p\\right|=1\" align=\"absmiddle\"><\/p><p class=\"has-light-green-cyan-background-color has-background\"><strong>Gabarito: B<\/strong><\/p><h3 class=\"wp-block-heading\"><strong>Quest&atilde;o 40<\/strong><\/h3><p>A figura abaixo exibe o tri&acirc;ngulo <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;ABC\" alt=\"\\large ABC\" align=\"absmiddle\">, em que <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;AB=BC\" alt=\"\\large AB=BC\" align=\"absmiddle\"> e <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;AD\" alt=\"\\large AD\" align=\"absmiddle\"> &eacute; uma altura de comprimento <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;h\" alt=\"\\large h\" align=\"absmiddle\">. A &aacute;rea do tri&acirc;ngulo <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;ABC\" alt=\"\\large ABC\" align=\"absmiddle\"> &eacute; igual a<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/cdn.blog.estrategiavestibulares.com.br\/vestibulares\/wp-content\/uploads\/2019\/11\/image120.png\" alt=\"\" class=\"wp-image-33666\"><\/figure><\/div><p>a) <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;h%5E%7B2%7D\" alt=\"\\large h^{2}\" align=\"absmiddle\"><\/p><p>b) <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Csqrt2h%5E2\" alt=\"\\large \\sqrt2h^2\" align=\"absmiddle\"><\/p><p>c) <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Csqrt3h%5E2\" alt=\"\\large \\sqrt3h^2\" align=\"absmiddle\"><\/p><p>d) <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;2h%5E%7B2%7D\" alt=\"\\large 2h^{2}\" align=\"absmiddle\"><\/p><h3 class=\"wp-block-heading\"><strong>Resolu&ccedil;&atilde;o Comentada<\/strong><\/h3><p>Percebendo que o tri&acirc;ngulo <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;ADB\" alt=\"\\large ADB\" align=\"absmiddle\"> &eacute; um ret&acirc;ngulo em <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;D\" alt=\"\\large D\" align=\"absmiddle\">, temos:<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;sen(30%5Cdegree)=%5Cfrac%7Bh%7D%7BAB%7D\" alt=\"\\large sen(30\\degree)=\\frac{h}{AB}\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Cfrac%7B1%7D%7B2%7D=%5Cfrac%7Bh%7D%7BAB%7D\" alt=\"\\large \\frac{1}{2}=\\frac{h}{AB}\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;AB=2h\" alt=\"\\large AB=2h\" align=\"absmiddle\"><\/p><p>Bem, a &aacute;rea do tri&acirc;ngulo <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;ABC\" alt=\"\\large ABC\" align=\"absmiddle\"> pode ser escrita em fun&ccedil;&atilde;o do lado <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;BC\" alt=\"\\large BC\" align=\"absmiddle\"> e da altura <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;h\" alt=\"\\large h\" align=\"absmiddle\">:<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;Area=%5Cfrac%7B1%7D%7B2%7D%5Ccdot&amp;space;BC%5Ccdot&amp;space;h\" alt=\"\\large Area=\\frac{1}{2}\\cdot BC\\cdot h\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;Area=%5Cfrac%7B1%7D%7B2%7D%5Ccdot&amp;space;AB%5Ccdot&amp;space;h\" alt=\"\\large Area=\\frac{1}{2}\\cdot AB\\cdot h\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;Area=%5Cfrac%7B1%7D%7B2%7D%5Ccdot&amp;space;2h%5Ccdot&amp;space;h\" alt=\"\\large Area=\\frac{1}{2}\\cdot 2h\\cdot h\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;Area=h%5E%7B2%7D\" alt=\"\\large Area=h^{2}\" align=\"absmiddle\"><\/p><p class=\"has-light-green-cyan-background-color has-background\"><strong>Gabarito: A<\/strong><\/p><h3 class=\"wp-block-heading\"><strong>Quest&atilde;o 41<\/strong><\/h3><p>A figura abaixo exibe o tri&acirc;ngulo ret&acirc;ngulo <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;ABC\" alt=\"\\large ABC\" align=\"absmiddle\">, em que <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;AB=AM=MC\" alt=\"\\large AB=AM=MC\" align=\"absmiddle\">. Ent&atilde;o, <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;tg%5Ctheta\" alt=\"\\large tg\\theta\" align=\"absmiddle\"> &eacute; igual a<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/cdn.blog.estrategiavestibulares.com.br\/vestibulares\/wp-content\/uploads\/2019\/11\/image121.png\" alt=\"\" class=\"wp-image-33668\"><\/figure><\/div><p>a) 1\/2<\/p><p>b) 1\/3<\/p><p>c) 1\/4<\/p><p>d) 1\/5<\/p><h3 class=\"wp-block-heading\"><strong>Resolu&ccedil;&atilde;o Comentada<\/strong><\/h3><p>Como <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;AB=AM\" alt=\"\\large AB=AM\" align=\"absmiddle\"> e o tri&acirc;ngulo <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;ABM\" alt=\"\\large ABM\" align=\"absmiddle\"> &eacute; ret&acirc;ngulo em <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;A\" alt=\"\\large A\" align=\"absmiddle\">, temos que <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;A%5Cwidehat%7BB%7DM=A%5Cwidehat%7BM%7DB=45%5Cdegree\" alt=\"\\large A\\widehat{B}M=A\\widehat{M}B=45\\degree\" align=\"absmiddle\">. Dessa forma, <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;A%5Cwidehat%7BB%7DM=45%5Cdegree+%5Ctheta\" alt=\"\\large A\\widehat{B}M=45\\degree+\\theta\" align=\"absmiddle\">.<\/p><p>O tri&acirc;ngulo <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;ABC\" alt=\"\\large ABC\" align=\"absmiddle\"> &eacute; ret&acirc;ngulo em <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;A\" alt=\"\\large A\" align=\"absmiddle\"> e, pelo enunciado, <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;AC=2AM\" alt=\"\\large AC=2AM\" align=\"absmiddle\">.<\/p><p>Dessa forma, podemos dizer que:<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;tg(%5Ctheta&amp;space;+&amp;space;45%5Cdegree)&amp;space;=&amp;space;%5Cfrac%7B2a%7D%7Ba%7D\" alt=\"\\large tg(\\theta + 45\\degree) = \\frac{2a}{a}\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Cfrac%7Btg(%5Ctheta&amp;space;)+tg(45%5Cdegree)%7D%7B1-tg(%5Ctheta&amp;space;)%5Ccdot&amp;space;tg(45%5Cdegree)%7D=2\" alt=\"\\large \\frac{tg(\\theta )+tg(45\\degree)}{1-tg(\\theta )\\cdot tg(45\\degree)}=2\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Cfrac%7Btg(%5Ctheta&amp;space;)+1%7D%7B1-tg(%5Ctheta&amp;space;)%5Ccdot&amp;space;1%7D=2\" alt=\"\\large \\frac{tg(\\theta )+1}{1-tg(\\theta )\\cdot 1}=2\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;tg%5Cleft(%5Ctheta%5Cright)+1=2%5Cleft(1-tg%5Cleft(%5Ctheta%5Cright)%5Cright)\" alt=\"\\large tg\\left(\\theta\\right)+1=2\\left(1-tg\\left(\\theta\\right)\\right)\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;tg%5Cleft(%5Ctheta%5Cright)+1=2-2%5Ccdot&amp;space;tg%5Cleft(%5Ctheta%5Cright)\" alt=\"\\large tg\\left(\\theta\\right)+1=2-2\\cdot tg\\left(\\theta\\right)\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;3%5Ccdot&amp;space;tg%5Cleft(%5Ctheta%5Cright)=1\" alt=\"\\large 3\\cdot tg\\left(\\theta\\right)=1\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;tg%5Cleft(%5Ctheta%5Cright)=%5Cfrac%7B1%7D%7B3%7D\" alt=\"\\large tg\\left(\\theta\\right)=\\frac{1}{3}\" align=\"absmiddle\"><\/p><p class=\"has-light-green-cyan-background-color has-background\"><strong>Gabarito: B<\/strong><\/p><h3 class=\"wp-block-heading\"><strong>Quest&atilde;o 42<\/strong><\/h3><p>Seja a fun&ccedil;&atilde;o polinomial do terceiro grau <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;f%5Cleft(x%5Cright)=x%5E3-x%5E2-2x+1\" alt=\"\\large f\\left(x\\right)=x^3-x^2-2x+1\" align=\"absmiddle\">, definida para todo n&uacute;mero real <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;x\" alt=\"\\large x\" align=\"absmiddle\">. A figura abaixo exibe o gr&aacute;fico de <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;y=f(x)\" alt=\"\\large y=f(x)\" align=\"absmiddle\">, no plano cartesiano, em que os pontos, A, B, e C t&ecirc;m a mesma ordenada. A dist&acirc;ncia entre os pontos A e C &eacute; igual a:<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/cdn.blog.estrategiavestibulares.com.br\/vestibulares\/wp-content\/uploads\/2019\/11\/image122.png\" alt=\"\" class=\"wp-image-33670\"><\/figure><\/div><p>a) 2<\/p><p>b) <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;2%5Csqrt%7B2%7D\" alt=\"\\large 2\\sqrt{2}\" align=\"absmiddle\"><\/p><p>c) 3<\/p><p>d) <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;3%5Csqrt%7B2%7D\" alt=\"\\large 3\\sqrt{2}\" align=\"absmiddle\"><\/p><h3>Resolu&ccedil;&atilde;o Comentada<\/h3><p>Como todos os pontos <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;(A,B,C)\" alt=\"\\large (A,B,C)\" align=\"absmiddle\"> representam mesma ordenada, vamos calcular o valor dessa ordenada por meio da ordenada de B, uma vez que ele est&aacute; no eixo vertical e, portanto, sabemos que sua abcissa &eacute; nula <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;(x=0)\" alt=\"\\large (x=0)\" align=\"absmiddle\">.<\/p><p>Ordenada de B<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;f%5Cleft(x%5Cright)=x%5E3-x%5E2-2x+1\" alt=\"\\large f\\left(x\\right)=x^3-x^2-2x+1\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;f%5Cleft(0%5Cright)=0%5E3-0%5E2-2%5Ccdot0+1\" alt=\"\\large f\\left(0\\right)=0^3-0^2-2\\cdot0+1\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;f%5Cleft(0%5Cright)=1\" alt=\"\\large f\\left(0\\right)=1\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;B=%5Cleft(0;1%5Cright)\" alt=\"\\large B=\\left(0;1\\right)\" align=\"absmiddle\"><\/p><p>Al&eacute;m disso, sabemos que as ordenadas de A e de C s&atilde;o dadas por <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;f(x)=1\" alt=\"\\large f(x)=1\" align=\"absmiddle\">, ou seja:<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;f(x)=1\" alt=\"\\large f(x)=1\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;x%5E3-x%5E2-2x+1=1\" alt=\"\\large x^3-x^2-2x+1=1\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;x%5E3-x%5E2-2x=0\" alt=\"\\large x^3-x^2-2x=0\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;x%5Cleft(x%5E2-x-2%5Cright)=0\" alt=\"\\large x\\left(x^2-x-2\\right)=0\" align=\"absmiddle\"><\/p><p>Como o produto &eacute; nulo, temos duas possibilidades:<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;x=0\" alt=\"\\large x=0\" align=\"absmiddle\"><\/p><p>ou<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;x%5E2-x-2=0\" alt=\"\\large x^2-x-2=0\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5CDelta&amp;space;=&amp;space;b%5E%7B2%7D-4%5Ccdot&amp;space;a%5Ccdot&amp;space;c=-1%5E%7B2%7D-4%5Ccdot&amp;space;1%5Ccdot&amp;space;(-2)=1+8=9\" alt=\"\\large \\Delta = b^{2}-4\\cdot a\\cdot c=-1^{2}-4\\cdot 1\\cdot (-2)=1+8=9\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;x=%5Cfrac%7B-b%5Cpm&amp;space;%5CDelta&amp;space;%7D%7B2%5Ccdot&amp;space;a%7D=%5Cfrac%7B-(-1)%5Cpm&amp;space;%5Csqrt%7B9%7D%7D%7B2%5Ccdot&amp;space;1%7D=\" alt=\"\\large x=\\frac{-b\\pm \\Delta }{2\\cdot a}=\\frac{-(-1)\\pm \\sqrt{9}}{2\\cdot 1}=\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Cleft%5C%7B%5Cbegin%7Bmatrix%7Dx%5E%5Cprime=%5Cfrac%7B1+3%7D%7B2%7D=2%5C%5C%5C&amp;space;%5C%5Cx%5E%7B%5Cprime%5Cprime%7D=%5Cfrac%7B1-3%7D%7B2%7D=-1%5C%5C%5Cend%7Bmatrix%7D%5Cright.\" alt=\"\\large \\left\\{\\begin{matrix}x^\\prime=\\frac{1+3}{2}=2\\\\\\ \\\\x^{\\prime\\prime}=\\frac{1-3}{2}=-1\\\\\\end{matrix}\\right.\" align=\"absmiddle\"><\/p><p class=\"has-light-green-cyan-background-color has-background\"><strong>Gabarito: C<\/strong><\/p><h3 class=\"wp-block-heading\"><strong>Quest&atilde;o 43<\/strong><\/h3><p>Sabendo que c &eacute; um n&uacute;mero real, considere, no plano cartesiano, a circunfer&ecirc;ncia de equa&ccedil;&atilde;o <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;x%5E2+y%5E2=2cx\" alt=\"\\large x^2+y^2=2cx\" align=\"absmiddle\">. Se o centro dessa circunfer&ecirc;ncia pertence &agrave; reta de equa&ccedil;&atilde;o <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;x+2y=3\" alt=\"\\large x+2y=3\" align=\"absmiddle\">, ent&atilde;o seu raio &eacute; igual a:<\/p><p>a) <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Csqrt%7B2%7D\" alt=\"\\large \\sqrt{2}\" align=\"absmiddle\"><\/p><p>b) <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Csqrt%7B3%7D\" alt=\"\\large \\sqrt{3}\" align=\"absmiddle\"><\/p><p>c) 2<\/p><p>d) 3<\/p><h3 class=\"wp-block-heading\"><strong>Resolu&ccedil;&atilde;o Comentada<\/strong><\/h3><p>Para deixarmos a c&ocirc;nica mais expl&iacute;cita,\nvamos completar quadrados e reescrev&ecirc;-la de modo mais evidente.<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;x%5E2+y%5E2=2cx\" alt=\"\\large x^2+y^2=2cx\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;x%5E2-2cx+y%5E2=0\" alt=\"\\large x^2-2cx+y^2=0\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;x%5E2-2cx+c%5E2+y%5E2=0+c%5E2\" alt=\"\\large x^2-2cx+c^2+y^2=0+c^2\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Cleft(x-c%5Cright)%5E2+y%5E2=c%5E2\" alt=\"\\large \\left(x-c\\right)^2+y^2=c^2\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;c=raio\" alt=\"\\large c=raio\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;Centro=%5Cleft(c,0%5Cright)\" alt=\"\\large Centro=\\left(c,0\\right)\" align=\"absmiddle\"><\/p><p>Como o centro deve estar de acordo com a equa&ccedil;&atilde;o da reta fornecida, podemos colocar as coordenadas <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Cleft(c,0%5Cright)\" alt=\"\\large \\left(c,0\\right)\" align=\"absmiddle\"> na equa&ccedil;&atilde;o da reta <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;x+2y=3\" alt=\"\\large x+2y=3\" align=\"absmiddle\">.<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;x+2y=3\" alt=\"\\large x+2y=3\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;c+2%5Ccdot0=3\" alt=\"\\large c+2\\cdot0=3\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;c=3\" alt=\"\\large c=3\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;raio=3\" alt=\"\\large raio=3\" align=\"absmiddle\"><\/p><p class=\"has-light-green-cyan-background-color has-background\"><strong>Gabarito: D<\/strong><\/p><h3 class=\"wp-block-heading\"><strong>Quest&atilde;o 44<\/strong><\/h3><p class=\"Questes-enunciado\">Se um tetraedro regular e um cubo t&ecirc;m &aacute;reas de superf&iacute;cie iguais, a raz&atilde;o entre o comprimento das arestas do tetraedro e o comprimento das arestas do cubo &eacute; igual a<\/p><p>a) <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Csqrt2%5Csqrt3\" alt=\"\\large \\sqrt2\\sqrt3\" align=\"absmiddle\"><\/p><p>b) <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Csqrt%5B4%5D%7B2%7D%5Csqrt3\" alt=\"\\large \\sqrt[4]{2}\\sqrt3\" align=\"absmiddle\"><\/p><p>c) <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Csqrt2%5Csqrt%5B4%5D%7B3%7D\" alt=\"\\large \\sqrt2\\sqrt[4]{3}\" align=\"absmiddle\"><\/p><p>d) <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Csqrt%5B4%5D%7B2%7D%5Csqrt%5B4%5D%7B3%7D\" alt=\"\\large \\sqrt[4]{2}\\sqrt[4]{3}\" align=\"absmiddle\"><\/p><h3 class=\"wp-block-heading\"><strong>Resolu&ccedil;&atilde;o Comentada<\/strong><\/h3><p>Lembrando que a &aacute;rea do tetraedro &eacute; dada por quatro vezes a &aacute;rea do tri&acirc;ngulo equil&aacute;tero de aresta <img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;a_%7BT%7D\" alt=\"\\large a_{T}\" align=\"absmiddle\">, temos:<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;A_%7BT%7D=%5Ccancel&amp;space;4%5Ccdot&amp;space;%5Cfrac%7Ba_%7BT%7D%5E%7B2%7D%5Csqrt%7B3%7D%7D%7B%5Ccancel4%7D\" alt=\"\\large A_{T}=\\cancel 4\\cdot \\frac{a_{T}^{2}\\sqrt{3}}{\\cancel4}\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;A_%7BT%7D=a_%7BT%7D%5E%7B2%7D%5Csqrt%7B3%7D\" alt=\"\\large A_{T}=a_{T}^{2}\\sqrt{3}\" align=\"absmiddle\"><\/p><p>Seguindo a orienta&ccedil;&atilde;o de igualar as &aacute;reas, temos:<\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;A_T=A_C\" alt=\"\\large A_T=A_C\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;a_T%5E2%5Csqrt3=6%5Ccdot&amp;space;l_C%5E2\" alt=\"\\large a_T^2\\sqrt3=6\\cdot l_C^2\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Cfrac%7Ba_T%5E2%7D%7Ba_C%5E2%7D=%5Cfrac%7B6%7D%7B%5Csqrt3%7D%5Ccdot%5Cfrac%7B%5Csqrt3%7D%7B%5Csqrt3%7D\" alt=\"\\large \\frac{a_T^2}{a_C^2}=\\frac{6}{\\sqrt3}\\cdot\\frac{\\sqrt3}{\\sqrt3}\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Cfrac%7Ba_T%5E2%7D%7Ba_C%5E2%7D=%5Cfrac%7B6%5Csqrt3%7D%7B3%7D\" alt=\"\\large \\frac{a_T^2}{a_C^2}=\\frac{6\\sqrt3}{3}\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Cfrac%7Ba_T%5E2%7D%7Ba_C%5E2%7D=2%5Csqrt3\" alt=\"\\large \\frac{a_T^2}{a_C^2}=2\\sqrt3\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Csqrt%7B%5Cfrac%7Ba_T%5E2%7D%7Ba_C%5E2%7D%7D=%5Csqrt%7B2%5Csqrt3%7D\" alt=\"\\large \\sqrt{\\frac{a_T^2}{a_C^2}}=\\sqrt{2\\sqrt3}\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Cleft%7C%5Cfrac%7Ba_T%7D%7Ba_C%7D%5Cright%7C=%5Csqrt2%5Csqrt%5B4%5D%7B3%7D\" alt=\"\\large \\left|\\frac{a_T}{a_C}\\right|=\\sqrt2\\sqrt[4]{3}\" align=\"absmiddle\"><\/p><p><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/svg.latex?%5Clarge&amp;space;%5Cfrac%7Ba_T%7D%7Ba_C%7D=%5Csqrt2%5Csqrt%5B4%5D%7B3%7D\" alt=\"\\large \\frac{a_T}{a_C}=\\sqrt2\\sqrt[4]{3}\" align=\"absmiddle\"><\/p><p class=\"has-light-green-cyan-background-color has-background\"><strong>Gabarito: C<\/strong><\/p><p>&Eacute; isso, pessoal! Espero que tenham curtido a resolu&ccedil;&atilde;o da prova de Matem&aacute;tica da prova do Vestibular UNICAMP 2020.&nbsp;Sigam-me nas redes sociais. T&ecirc;m muitas dicas l&aacute;. Mande uma mensagem, caso tenha tido alguma d&uacute;vida. Abra&ccedil;os!<\/p><p><strong>Instagram:<\/strong>&nbsp;<a href=\"https:\/\/www.instagram.com\/professor.marcal\/\" target=\"_blank\">@professor.marcal<\/a><\/p><p>Confira tamb&eacute;m os cursos e simulados preparat&oacute;rios do Estrat&eacute;gia Vestibulares para conquistar a vaga dos seus sonhos!<\/p><div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-luminous-vivid-amber-to-luminous-vivid-orange-gradient-background has-background\" href=\"https:\/\/www.estrategiavestibulares.com.br\/\" style=\"border-radius:50px\" target=\"_blank\">ESTRAT&Eacute;GIA VESTIBULARES<\/a><\/div>\n<\/div><p class=\"has-text-align-center has-luminous-vivid-amber-background-color has-background has-medium-font-size\"><a href=\"https:\/\/estrategiavestibulares.com.br\/vestibulares\/unesp\/\" target=\"_blank\" rel=\"noopener noreferrer\">CURSOS PARA UNICAMP<\/a><\/p><\/p>\n","protected":false},"excerpt":{"rendered":"Ol&aacute;, pessoal&hellip; Tudo bem? Sou a prof. Mar&ccedil;al, do Estrat&eacute;gia Vestibulares, e escrevo este artigo para lan&ccedil;ar o&hellip;\n","protected":false},"author":18,"featured_media":33672,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"wl_entities_gutenberg":"","footnotes":""},"categories":[29],"tags":[],"wl_entity_type":[732],"class_list":{"0":"post-33654","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-matematica","8":"wl_entity_type-article"},"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.9 (Yoast SEO v25.9) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Prova Unicamp 2020 \u2013 Matem\u00e1tica \u2013 Resolu\u00e7\u00e3o Comentada<\/title>\n<meta name=\"description\" content=\"O Estrat\u00e9gia Vestibulares traz para voc\u00ea a resolu\u00e7\u00e3o comentada da prova de matem\u00e1tica do vestibular Unicamp! 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