'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 二元一次方程组的检验法 常用的方法是：将这对数值分别代入方程组中的每个方程，只...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 什么是等式，什么是方程? 含有等号的式子叫做等式.例如a=b，1+4=5,2a-b=9等都是等式. 含有...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 二元一次方程组：代入消元法 (1)基本思路：未知数又多变少。 (2)消元法的基本方法：将...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 二元一次方程组的应用...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 二元一次方程组的应用...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 利用等式的性质对等式进行变形 【例1】(2014秋o淮南期末)以下等式变形不正确的是( )...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 利用等式的性质解方程 【例2】利用等式的性质解方程： (1) 1/6x= 1/18; (2)5﹣x=7; (3)0.2x+5...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 列方程组解应用题的基本思想列方程组解应用题，是把未知转换成已知的重要方法，它...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 2.二元一次方程组 (1)概念：具有相同未知数的两个二元一次方程合在一起，就组成了一...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 二元一次方程的判定标准： 1.二元：有两个未知数 2.一次：未知数的系数为1 3.整式方程...