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(2xy/x2-y2)+(x+y/x)-(y/y-x)
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人气:140 ℃ 时间:2020-06-19 14:35:11
解答
(2xy/x2-y2)+(x/x+y)-(y/y-x)
=(2xy+x²-xy+xy+y²)/(x+y)(x-y)
=(x+y)²/(x+y)(x-y)
=(x+y)/(x-y)
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