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(2014•西城区模拟)先化简,再求值:2x2x2-2x1÷(2?

2018-06-02 03:11:31E***
(2014•西城区模拟)先化简,再求值:2x2x2-2x 1÷(2x 1x 1 1x-1),其中x=2.(2014•西城区模拟)先化简,再求值:2x2x2-2x1÷(2x1x1...(2014•西城区模拟)先化简,再求值:2x2x2-2x1÷(2x1x11x-1)?

最佳回答

  • 解答:解:原式=2x2(x-1)2÷(2x 1)(x-1) x 1(x 1)(x-1)
    =2x2(x-1)2÷2x2(x 1)(x-1)
    =2x2(x-1)2•(x 1)(x-1)2x2
    =x 1x-1,
    当x=2时,原式=2 12-1=3.
    2018-06-02 05:39:34
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