练习册

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  • 试题
    已知.求的值. 2先化简.再求值: .其中.． 解:解:原式······················································· 4分 ·························································································································· 6分 当.时. 原式···································································································· 8分 【查看更多】

     

    题目列表(包括答案和解析)

    已知，求的值．

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    （6分）化简求值：已知，求的值

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    已知，求的值。

     

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    化简或求值：

    （1）化简：

    （2）已知，求的值。

     

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    已知，求的值.

     

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