计算 (x²/x+y)-x-y

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计算 (x²/x+y)-x-y

是不是x²/(x+y)-x-y?
x²/(x+y)-x-y=x²/(x+y)-(x+y)²/(x+y)=[x²-(x+y)²]/(x+y)=-(2xy+y²)/(x+y)
=-y(2x+y)/(x+y)

=(x+y)-x-y
=x+y-x-y
=0