{"id":25031,"date":"2023-04-14T00:35:28","date_gmt":"2023-04-13T23:35:28","guid":{"rendered":"https:\/\/www.acasinhadamatematica.pt\/?p=25031"},"modified":"2023-04-18T10:32:24","modified_gmt":"2023-04-18T09:32:24","slug":"num-cibercafe","status":"publish","type":"post","link":"https:\/\/www.acasinhadamatematica.pt\/?p=25031","title":{"rendered":"Num cibercaf\u00e9"},"content":{"rendered":"\n<p><ul id='GTTabs_ul_25031' class='GTTabs' style='display:none'>\n<li id='GTTabs_li_0_25031' class='GTTabs_curr'><a  id=\"25031_0\" onMouseOver=\"GTTabsShowLinks('Enunciado'); return true;\"  onMouseOut=\"GTTabsShowLinks();\"  class='GTTabsLinks'>Enunciado<\/a><\/li>\n<li id='GTTabs_li_1_25031' ><a  id=\"25031_1\" onMouseOver=\"GTTabsShowLinks('Resolu\u00e7\u00e3o'); return true;\"  onMouseOut=\"GTTabsShowLinks();\"  class='GTTabsLinks'>Resolu\u00e7\u00e3o<\/a><\/li>\n<\/ul>\n\n<div class='GTTabs_divs GTTabs_curr_div' id='GTTabs_0_25031'>\n<span class='GTTabs_titles'><b>Enunciado<\/b><\/span><\/p>\n<p><a href=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2023\/04\/8_Pag165-3.png\"><img loading=\"lazy\" decoding=\"async\" data-attachment-id=\"25034\" data-permalink=\"https:\/\/www.acasinhadamatematica.pt\/?attachment_id=25034\" data-orig-file=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2023\/04\/8_Pag165-3.png\" data-orig-size=\"550,704\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"8_Pag165-3\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2023\/04\/8_Pag165-3.png\" class=\"alignright wp-image-25034\" src=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2023\/04\/8_Pag165-3-234x300.png\" alt=\"\" width=\"400\" height=\"512\" srcset=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2023\/04\/8_Pag165-3-234x300.png 234w, https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2023\/04\/8_Pag165-3.png 550w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/a><\/p>\n<p>Num &#8220;cibercaf\u00e9&#8221;, o Henrique paga 0,30 euros por cada minuto utilizado nos computadores. O saldo do Henrique vai sendo registado e <span style=\"text-decoration: underline;\">no final<\/span>, depois de ter desligado o ambiente de trabalho, <span style=\"text-decoration: underline;\">ser\u00e1 feito o acerto de contas<\/span>.<\/p>\n<p>A rela\u00e7\u00e3o entre o tempo (em minutos) de utiliza\u00e7\u00e3o e o saldo do Henrique \u00e9 uma fun\u00e7\u00e3o.<\/p>\n<ol>\n<li>Que gr\u00e1ficos poderiam representar esta fun\u00e7\u00e3o?<br \/>Justifica a tua escolha e apresenta uma raz\u00e3o para n\u00e3o escolheres os outros.<\/li>\n<li>Se o Henrique utilizar o computador por 40 minutos, quanto vai pagar?<\/li>\n<li>Que express\u00e3o alg\u00e9brica permite estabelecer uma rela\u00e7\u00e3o entre o tempo e o saldo?<\/li>\n<li>Um cliente que apresente um saldo de \u22127,80 \u20ac, quanto tempo esteve no computador?<\/li>\n<\/ol>\n<p><div class='GTTabsNavigation' style='display:none'><span class='GTTabs_nav_next'><a href='#GTTabs_ul_25031' onClick='GTTabs_show(1,25031)'>Resolu\u00e7\u00e3o &gt;&gt;<\/a><\/span><\/div><\/div>\n\n<div class='GTTabs_divs' id='GTTabs_1_25031'>\n<span class='GTTabs_titles'><b>Resolu\u00e7\u00e3o<\/b><\/span><!--more--><\/p>\n<p><a href=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2023\/04\/8_Pag165-3.png\"><img loading=\"lazy\" decoding=\"async\" data-attachment-id=\"25034\" data-permalink=\"https:\/\/www.acasinhadamatematica.pt\/?attachment_id=25034\" data-orig-file=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2023\/04\/8_Pag165-3.png\" data-orig-size=\"550,704\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"8_Pag165-3\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2023\/04\/8_Pag165-3.png\" class=\"alignright wp-image-25034\" src=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2023\/04\/8_Pag165-3-234x300.png\" alt=\"\" width=\"400\" height=\"512\" srcset=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2023\/04\/8_Pag165-3-234x300.png 234w, https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2023\/04\/8_Pag165-3.png 550w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/a><\/p>\n<blockquote>\n<p>Num &#8220;cibercaf\u00e9&#8221;, o Henrique paga 0,30 euros por cada minuto utilizado nos computadores. O saldo do Henrique vai sendo registado e <span style=\"text-decoration: underline;\">no final<\/span>, depois de ter desligado o ambiente de trabalho, <span style=\"text-decoration: underline;\">ser\u00e1 feito o acerto de contas<\/span>.<\/p>\n<p>A rela\u00e7\u00e3o entre o tempo (em minutos) de utiliza\u00e7\u00e3o e o saldo do Henrique \u00e9 uma fun\u00e7\u00e3o.<\/p>\n<\/blockquote>\n<ol>\n<li>Poderiam representar esta fun\u00e7\u00e3o apenas os gr\u00e1ficos D e E. Com efeito, como o acerto de contas \u00e9 feito no final e se considera que n\u00e3o h\u00e1 qualquer adiantamento de dinheiro por parte do Henrique, o seu saldo come\u00e7ar\u00e1 por ser nulo no in\u00edcio da utiliza\u00e7\u00e3o do computador e decrescer\u00e1 por valores negativos ao longo do tempo.<br \/><br \/><\/li>\n<li>Se o Henrique utilizar o computador por 40 minutos, ir\u00e1 pagar \\(0,30 \\times 40 = 12\\) \u20ac.<br \/><br \/><\/li>\n<li>Uma express\u00e3o alg\u00e9brica que permite estabelecer uma rela\u00e7\u00e3o entre o tempo e o saldo \u00e9: \\(s = &#8211; 0,3\\,t\\).<br \/><br \/><\/li>\n<li>Um cliente que apresente um saldo de \u22127,80 \u20ac, esteve a utilizar o computador 26 minutos:<\/li>\n<\/ol>\n<p>\\[\\begin{array}{*{20}{l}}{s = &#8211; 7,80}&amp; \\Leftrightarrow &amp;{ &#8211; 0,3\\,t = &#8211; 7,8}\\\\{}&amp; \\Leftrightarrow &amp;{t = \\frac{{7,8}}{{0,3}}}\\\\{}&amp; \\Leftrightarrow &amp;{t = 26}\\end{array}\\]<\/p>\n<div class='GTTabsNavigation' style='display:none'><span class='GTTabs_nav_prev'><a href='#GTTabs_ul_25031' onClick='GTTabs_show(0,25031)'>&lt;&lt; Enunciado<\/a><\/span><\/div><\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>Enunciado Resolu\u00e7\u00e3o Enunciado Num &#8220;cibercaf\u00e9&#8221;, o Henrique paga 0,30 euros por cada minuto utilizado nos computadores. O saldo do Henrique vai sendo registado e no final, depois de ter desligado o ambiente de trabalho,&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":25035,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[100,97,709],"tags":[424,710,344],"series":[],"class_list":["post-25031","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-8--ano","category-aplicando","category-graficos-de-funcoes-afins","tag-8-o-ano","tag-funcao-linear","tag-grafico"],"views":84,"jetpack_featured_media_url":"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2023\/04\/8_Pag165-3_520x245.png","jetpack_sharing_enabled":true,"jetpack_likes_enabled":true,"_links":{"self":[{"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=\/wp\/v2\/posts\/25031","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=25031"}],"version-history":[{"count":0,"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=\/wp\/v2\/posts\/25031\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=\/wp\/v2\/media\/25035"}],"wp:attachment":[{"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=25031"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25031"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25031"},{"taxonomy":"series","embeddable":true,"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=%2Fwp%2Fv2%2Fseries&post=25031"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}