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(x+y分之y)-(y²-x²分之xy)
人气:182 ℃ 时间:2020-04-03 13:36:31
解答
=y/(x+y)+xy/(x+y)(x-y)
=[y(x-y)+xy]/(x+y)(x-y)
=(2xy-y²)/(x²-y²)
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