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

先化简,再求值:(每小题6分,共12分)

(1)6ec8aac122bd4f6e,其中x = – 2;

(2)6ec8aac122bd4f6e,其中6ec8aac122bd4f6e

 

(1)-12 (2)-95 【解析】 (1) 【解析】 原式 ··································································· 3分 当x = – 2时,原式··································· 4分 ······························································ 6分 (2) 【解析】 原式····························· 2分 ········································································ 4分 当时 原式  ··············································································· 6分
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