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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