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(5分)先化简,再求值:,其中a=-2,b=.

(5分)先化简,再求值:6ec8aac122bd4f6e,其中a=-2,b=6ec8aac122bd4f6e

 

 

【解析】 原式···················································· 2分 ····················································································· 3分 ································································································ 4分 当a=-2,b=1时,原式=  = ························································· 5分 【解析】略
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