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）
，其中x =" –" 2；（2）
，其中（1）-12
（2）-95
(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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