摘要：． 先化简.再求值:(-)÷.其中x＝1． 解:原式=[–]×························································· 3分 =×–× =–·································································································· 4分 =– =··········································································································· 5分 当x=1时. 原式=····································································································· 6分 = 1················································································································· 7分

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