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x的平方-1分之x的平方-2x+1)÷(x+1分之2-2x

2012-02-28 06:18:282***
x的平方-1分之x的平方-2x+1)÷(x+1分之2-2x：(x^2-2x+1)/(x^2-1) / [(2-2x)/(x+1)] =(x-1)^2/[(x+?

最佳回答

  • (x^2-2x+1)/(x^2-1) / [(2-2x)/(x+1)] =(x-1)^2/[(x+1)(x-1)] / [2(1-x)/(x+1)] =(x-1)/(x+1) * (x+1) /[2(1-x)] =-(x-1)/[2(x-1)] =-1/2
    2012-02-28 07:31:12
    • 很赞哦！ (277)

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