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
当x = – 2时,原式··································· 4分
······························································ 6分
(2) 解:原式····························· 2分
········································································ 4分
当时
原式
··············································································· 6分
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