分式计算(x+y)( x^2/x^2-y^2)+(y^2/x-y)-(2x^2y-2xy^2/x^2-2xy+y^2)
2个回答
答案:x-y
原式= x^2/(x-y)+y^2/(x-y)-2xy
= (x^2-2xy+y^2)/(x-y)
=(x-y)^2/(x-y)
=x-y
楼上的,啊 看了我的当然简单……
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