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(本小题满分7分) 先化简,再求值:,其中.

(本小题满分7分)

先化简,再求值:6ec8aac122bd4f6e,其中6ec8aac122bd4f6e.

 

【解析】 原式··················································· (2分) ····························································· (2分) ······························································································ (2分) 当时,原式的值为1。                          ( 1分) 【解析】略
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