Ch\u01b0\u01a1ng 4 – B\u00e0i 21: \u0110i\u1ec7n t\u1eeb tr\u01b0\u1eddng<\/a><\/blockquote><\/iframe><script type=\"text\/javascript\">\n\/*! This file is auto-generated *\/\n!function(c,d){\"use strict\";var e=!1,o=!1;if(d.querySelector)if(c.addEventListener)e=!0;if(c.wp=c.wp||{},c.wp.receiveEmbedMessage);else if(c.wp.receiveEmbedMessage=function(e){var t=e.data;if(!t);else if(!(t.secret||t.message||t.value));else if(\/[^a-zA-Z0-9]\/.test(t.secret));else{for(var r,s,a,i=d.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),n=d.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),o=new RegExp(\"^https?:$\",\"i\"),l=0;l<n.length;l++)n[l].style.display=\"none\";for(l=0;l<i.length;l++)if(r=i[l],e.source!==r.contentWindow);else{if(r.removeAttribute(\"style\"),\"height\"===t.message){if(1e3<(s=parseInt(t.value,10)))s=1e3;else if(~~s<200)s=200;r.height=s}if(\"link\"===t.message)if(s=d.createElement(\"a\"),a=d.createElement(\"a\"),s.href=r.getAttribute(\"src\"),a.href=t.value,!o.test(a.protocol));else if(a.host===s.host)if(d.activeElement===r)c.top.location.href=t.value}}},e)c.addEventListener(\"message\",c.wp.receiveEmbedMessage,!1),d.addEventListener(\"DOMContentLoaded\",t,!1),c.addEventListener(\"load\",t,!1);function t(){if(o);else{o=!0;for(var e,t,r,s=-1!==navigator.appVersion.indexOf(\"MSIE 10\"),a=!!navigator.userAgent.match(\/Trident.*rv:11\\.\/),i=d.querySelectorAll(\"iframe.wp-embedded-content\"),n=0;n<i.length;n++){if(!(r=(t=i[n]).getAttribute(\"data-secret\")))r=Math.random().toString(36).substr(2,10),t.src+=\"#?secret=\"+r,t.setAttribute(\"data-secret\",r);if(s||a)(e=t.cloneNode(!0)).removeAttribute(\"security\"),t.parentNode.replaceChild(e,t);t.contentWindow.postMessage({message:\"ready\",secret:r},\"*\")}}}}(window,document);\n<\/script>\n","description":"B\u00e0i 1 (trang 111 SGK V\u1eadt L\u00fd 12):\u00a0Ph\u00e1t bi\u1ec3u m\u1ed1i quan h\u1ec7 gi\u1eefa s\u1ef1 bi\u1ebfn thi\u00ean theo th\u1eddi gian c\u1ee7a t\u1eeb tr\u01b0\u1eddng v\u00e0 \u0111i\u1ec7n tr\u01b0\u1eddng xo\u00e1y. L\u1eddi gi\u1ea3i: N\u1ebfu t\u1ea1i m\u1ed9t n\u01a1i c\u00f3 m\u1ed9t t\u1eeb tr\u01b0\u1eddng bi\u1ebfn thi\u00ean theo th\u1eddi gian th\u00ec t\u1ea1i n\u01a1i \u0111\u00f3 xu\u1ea5t hi\u1ec7n m\u1ed9t \u0111i\u1ec7n tr\u01b0\u1eddng xo\u00e1y. B\u00e0i 2 (trang 111 […]"}