化简 (x^2+y^2)/(x-y)+2xy/y-x
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化简 (x^2+y^2)/(x-y)+2xy/y-x
化简 (x^2+y^2)/(x-y)+2xy/y-x
化简 (x^2+y^2)/(x-y)+2xy/y-x
(x^2+y^2)/(x-y)+2xy/y-x
=(x^2+y^2-2xy)/x-y
=(x-y)^2/(x-y)
=x-y
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(x^2+y^2)/(x-y)+2xy/y-x
=(x²+y²)/(x-y)-2xy/(x-y)
=(x²-2xy+y²)/(x-y)
=(x-y)²/(x-y)
=x-y