题文
先化简,再求值:(每小题6分,共12分) (1),其中x =" –" 2; (2),其中 |
题型:解答题 难度:偏易
答案
(1) 解:原式
··································································· 3分 当x =" –" 2时,原式··································· 4分 ······························································ 6分 (2) 解:原式····························· 2分
········································································ 4分 当时 原式 ··············································································· 6分 |
据专家权威分析,试题“先化简,再求值:(每小题6分,共12分)(1),其中x="–"2;(2),其..”主要考查你对 二元一次方程组的定义,二元一次方程的定义,二元一次方程组的解法,二元一次方程组的应用 等考点的理解。关于这些考点的“档案”如下:
二元一次方程组的定义二元一次方程的定义二元一次方程组的解法二元一次方程组的应用
考点名称:二元一次方程组的定义 考点名称:二元一次方程的定义 考点名称:二元一次方程组的解法 考点名称:二元一次方程组的应用
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