{"id":191795,"date":"2023-05-24T22:24:53","date_gmt":"2023-05-25T01:24:53","guid":{"rendered":"http:\/\/clubes.obmep.org.br\/blog\/?page_id=191795"},"modified":"2023-05-24T22:24:53","modified_gmt":"2023-05-25T01:24:53","slug":"a-problema-para-ajudar-na-escola-muitas-raizes","status":"publish","type":"page","link":"https:\/\/clubes.obmep.org.br\/blog\/a-problema-para-ajudar-na-escola-muitas-raizes\/","title":{"rendered":"(A) Problema para ajudar na escola: Muitas ra\u00edzes"},"content":{"rendered":"<p class=\"ti3\"  style=\"text-align:center;\">Clique no bot\u00e3o abaixo para visualizar o problema.<\/p>\n<div style=\"text-align:center;margin-top:10px;\">\n<input class=\"bo1 c1 cb13\" style=\"width:150px;\" value=\"Problema\" title=\"Clique aqui\" type=\"button\" onclick=    \"if(this.parentNode.getElementsByTagName('div')[0].style.display != ''){this.parentNode.getElementsByTagName('div')[0].style.display = '';this.value = 'Ocultar';} else{this.parentNode.getElementsByTagName('div')[0].style.display = 'none'; this.value = 'Problema';}\" \/>  <\/p>\n<div style=\"display: none;\">\n<p style=\"margin:10px\">\n<div class=\"g1n\" style=\"line-height:35px;\">\n<p class=\"tit\" style=\"line-height:25px;margin:10px\">Problema<br \/>\n<span style=\"font-size:12px;color:#00BF00\"> (A partir do 9\u00ba ano do E. F. &#8211; <span style=\"font-weight: normal;\"> N\u00edvel de dificuldade: F\u00e1cil<\/span>)<\/span><\/p>\n<hr style=\"height:1px; width:100%;background-color:#800000; margin-top: 10px; margin-bottom: 20px;border: 0 none\"\/>\n<p>Determinar o valor num\u00e9rico de [tex]N[\/tex],<br \/>\n[tex]\\qquad N=\\dfrac{\\sqrt{23}\\left(xy+10\\right)}{x+y}+ \\dfrac{y+2\\sqrt{29}}{x}[\/tex],<br \/>\nsabendo que [tex]x=\\sqrt{23}+\\sqrt{29} \\, [\/tex] e [tex] \\, y=\\sqrt{23}-\\sqrt{29}[\/tex].<\/p>\n<p style=\"margin:20px\">\n<\/div>\n<p style=\"margin:30px\">\n<div class=\"g1n\" style=\"line-height:35px;\">\n<p class=\"tit\" style=\"line-height:30px;margin:10px\">Solu\u00e7\u00e3o <\/p>\n<hr style=\"height:1px; width:100%;background-color:#800000; margin-top: 10px; margin-bottom: 20px;border: 0 none\"\/>\n<p>Vamos resolver o problema trabalhando separadamente com cada parcela da soma [tex]N[\/tex] proposta.<\/p>\n<ul>\n<li>Sabemos que [tex]x=\\sqrt{23}+\\sqrt{29} \\, [\/tex] e [tex] \\, y=\\sqrt{23}-\\sqrt{29}[\/tex], assim:<br \/>\n[tex]\\qquad xy= \\left(\\sqrt{23}+\\sqrt{29}\\right)\\times\\left(\\sqrt{23}-\\sqrt{29}\\right)[\/tex]<br \/>\n[tex]\\qquad xy= \\left(\\sqrt{23}\\right)^2-\\left(\\sqrt{29}\\right)^2[\/tex]<br \/>\n[tex]\\qquad xy= 23-29[\/tex]<br \/>\n[tex]\\qquad xy= -6, \\qquad \\textcolor{#800000}{(i)}[\/tex]<br \/>\ne, tamb\u00e9m:<br \/>\n[tex]\\qquad x+y= \\left(\\sqrt{23}+\\sqrt{29}\\right)+\\left(\\sqrt{23}-\\sqrt{29}\\right)[\/tex]<br \/>\n[tex]\\qquad x+y= \\left(\\sqrt{23}+\\sqrt{23}\\right)+\\left(\\sqrt{29}-\\sqrt{29}\\right)[\/tex]<br \/>\n[tex]\\qquad x+y= 2\\sqrt{23}+0[\/tex]<br \/>\n[tex]\\qquad x+y= 2\\sqrt{23}. \\qquad \\textcolor{#800000}{(ii)}[\/tex]<br \/>\nAssim, de [tex]\\textcolor{#800000}{(i)}[\/tex] e [tex]\\textcolor{#800000}{(ii)}[\/tex] segue que<br \/>\n[tex]\\qquad N_1=\\dfrac{\\sqrt{23}\\left(xy+10\\right)}{x+y}[\/tex]<br \/>\n[tex]\\qquad N_1=\\dfrac{\\sqrt{23}\\left(-6+10\\right)}{2\\sqrt{23}}[\/tex]<br \/>\n[tex]\\qquad N_1=\\dfrac{\\cancel{\\sqrt{23}} \\times 4}{2\\times \\cancel{\\sqrt{23}}}[\/tex]<br \/>\n[tex]\\qquad N_1=\\dfrac{4}{2}[\/tex]<br \/>\n[tex]\\qquad \\boxed{N_1=2}.[\/tex]\n<\/li>\n<\/ul>\n<ul>\n<li>Por outro lado, como [tex]x=\\sqrt{23}+\\sqrt{29} \\, [\/tex] e [tex] \\, y=\\sqrt{23}-\\sqrt{29}[\/tex], ent\u00e3o:<br \/>\n[tex]\\qquad y+2\\sqrt{29}=\\sqrt{23}-\\sqrt{29}+2\\sqrt{29}[\/tex]<br \/>\n[tex]\\qquad y+2\\sqrt{29}=\\sqrt{23}+\\sqrt{29}[\/tex]<br \/>\n[tex]\\qquad y+2\\sqrt{29}=x[\/tex].<br \/>\nPortanto,<br \/>\n[tex]\\qquad N_2= \\dfrac{y+2\\sqrt{29}}{x}[\/tex]<br \/>\n[tex]\\qquad N_2= \\dfrac{x}{x}[\/tex]<br \/>\n[tex]\\qquad \\boxed{N_2= 1}[\/tex].\n<\/li>\n<\/ul>\n<p>Dessa forma, segue que:<br \/>\n[tex]\\qquad N=\\dfrac{\\sqrt{23}\\left(xy+10\\right)}{x+y}+ \\dfrac{y+2\\sqrt{29}}{x}[\/tex]<br \/>\n[tex]\\qquad N=N_1+ N_2[\/tex]<br \/>\n[tex]\\qquad N=2+1[\/tex],<br \/>\nou seja,  [tex]\\fcolorbox{black}{#eee0e5}{$N=3$}[\/tex].<\/p>\n<hr style=\"height:1px; width:100%;background-color:#800000; margin-top: 10px; margin-bottom: 15px;border: 0 none\"\/>\n<p class=\"g2\" style=\"line-height:20px;\">Solu\u00e7\u00e3o elaborada pelos <strong>Moderadores do Blog<\/strong>.<\/p>\n<\/div>\n<p style=\"margin:20px\">\n<table style=\" height:auto; margin-left: auto; margin-right: auto;width:640px;\">\n<tr>\n<td class=\"bf\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1001 alignright\" style=\"border: 0px;\" alt=\"\" src=\"http:\/\/clubes.obmep.org.br\/blog\/wp-content\/uploads\/2013\/01\/menino.jpg\" width=\"80\" height=\"115\" \/><\/td>\n<td class=\"bf\">\n<p class=\"fala\" style=\"width:520px;background-color: #FFF5EE; padding:10px; font-family: calibri; font-size: 13px;color: #1C1C1C; line-height: 20px; \"> Se for conveniente, voc\u00ea pode obter um arquivo PDF desta p\u00e1gina, com o problema e a solu\u00e7\u00e3o, clicando no bot\u00e3o abaixo.<br \/>\nVoc\u00ea pode abrir o arquivo diretamente no seu navegador (<em>Chrome<\/em>, <em>Edge<\/em>, <em>Firefox<\/em>, <em>Safari<\/em>, entre outros), mas tamb\u00e9m pode utilizar o software gratuito <em><strong>Adobe Acrobat Reader<\/strong><\/em>.<br \/>\nCaso o dispositivo que voc\u00ea est\u00e1 utilizando n\u00e3o tenha o <strong><em>Acrobat Reader<\/em><\/strong> instalado, \u00e9 s\u00f3 clicar <a href=\"http:\/\/get.adobe.com\/br\/reader\/\" rel=\"noopener\" target=\"_blank\"><strong>AQUI<\/strong><\/a> para fazer o download adequado ao seu dispositivo.<\/p>\n<\/td>\n<\/tr>\n<\/table>\n<div style=\" float:right;  width: 100px;\">\n<p style=\"text-align: center; border-style: dotted; border-color :#FFFAFA; border-width :thin; width:90px;  height:40px;  padding: 5px; background-color: #800000;\">\n<a href=\"http:\/\/clubes.obmep.org.br\/blog\/wp-content\/uploads\/2019\/11\/Muitas-ra\u00edzes.pdf\" title=\" Arquivo PDF\" download=\"Clubes_ Muitas ra\u00edzes.pdf\"><span style=\"color: #FFFAFA; font-family: georgia; font-size: 16px;\"><strong>Arquivo <\/strong><\/span><\/a>\n <\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Clique no bot\u00e3o abaixo para visualizar o problema. Problema (A partir do 9\u00ba ano do E. F. &#8211; N\u00edvel de dificuldade: F\u00e1cil) Determinar o valor num\u00e9rico de [tex]N[\/tex], [tex]\\qquad N=\\dfrac{\\sqrt{23}\\left(xy+10\\right)}{x+y}+ \\dfrac{y+2\\sqrt{29}}{x}[\/tex], sabendo que [tex]x=\\sqrt{23}+\\sqrt{29} \\, [\/tex] e [tex] \\, y=\\sqrt{23}-\\sqrt{29}[\/tex]. Solu\u00e7\u00e3o Vamos resolver o problema trabalhando separadamente com cada parcela da soma [tex]N[\/tex] proposta. Sabemos &hellip; <\/p>\n<p><a class=\"more-link btn\" href=\"https:\/\/clubes.obmep.org.br\/blog\/a-problema-para-ajudar-na-escola-muitas-raizes\/\">Continue lendo<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"template-onecolumn.php","meta":{"footnotes":""},"class_list":["post-191795","page","type-page","status-publish","hentry","nodate","item-wrap"],"_links":{"self":[{"href":"https:\/\/clubes.obmep.org.br\/blog\/wp-json\/wp\/v2\/pages\/191795","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/clubes.obmep.org.br\/blog\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/clubes.obmep.org.br\/blog\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/clubes.obmep.org.br\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/clubes.obmep.org.br\/blog\/wp-json\/wp\/v2\/comments?post=191795"}],"version-history":[{"count":1,"href":"https:\/\/clubes.obmep.org.br\/blog\/wp-json\/wp\/v2\/pages\/191795\/revisions"}],"predecessor-version":[{"id":191796,"href":"https:\/\/clubes.obmep.org.br\/blog\/wp-json\/wp\/v2\/pages\/191795\/revisions\/191796"}],"wp:attachment":[{"href":"https:\/\/clubes.obmep.org.br\/blog\/wp-json\/wp\/v2\/media?parent=191795"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}