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（x-y+4xy/x-y）（x+y-4xy/x+y）怎么化简？有?

2014-06-01 08:30:46a***
（x-y+4xy/x-y）（x+y-4xy/x+y）怎么化简？ 有步骤<br>（x-y+4xy/x-y）（x+y-4xy/x+y）怎么化简？有步骤br：原式= [(x-y)^2/(x-y) + 4xy/(x-y)] [(x?

最佳回答

  • 原式= [(x-y)^2/(x-y) + 4xy/(x-y)] [(x+y)^2/(x+y) - 4xy/(x+y)] = {[(x-y)^2 + 4xy]/(x-y)}{[(x+y)^2 - 4xy]/(x+y)} =[(x+y)^2/(x-y)][(x-y)^2/(x+y)] =(x+y)(x-y) =x^2 - Y^2
    2014-06-01 11:35:45
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