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    ． 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 【查看更多】

     

    题目列表(包括答案和解析)

    （2008•宝安区二模）先化简，再求值：(
    a-1
    a+2
    -
    1
    a-2
    )÷
    a2-8a+16
    a2-4
    ，其中a=-3．

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    （2008•资阳）先化简，再求值：，其中x=1．

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    （2008•资阳）先化简，再求值：，其中x=1．

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    （2008•资阳）先化简，再求值：，其中x=1．

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    （2008•资阳）先化简，再求值：，其中x=1．

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