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=(
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