题目内容
(10分) 先化简,再求值:,其中.
当时,原式
解:原式··········································· 2分
··························································· 4分
···················································································· 8分
当时,原式······························································· 10分
··························································· 4分
···················································································· 8分
当时,原式······························································· 10分
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