题目内容

先化简,再求值:(每小题6分,共12分)
(1),其中x =" –" 2;
(2),其中

(1)-12
(2)-95解析:

(1) 解:原式

··································································· 3分
x =" –" 2时,原式··································· 4分
······························································ 6分
(2) 解:原式····························· 2分

········································································ 4分

原式 
··············································································· 6分
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