[y(x-y)+x(x+y)-x的平方]除以(-y)

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[y(x-y)+x(x+y)-x的平方]除以(-y)
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[y(x-y)+x(x+y)-x的平方]除以(-y)
[y(x-y)+x(x+y)-x的平方]除以(-y)

[y(x-y)+x(x+y)-x的平方]除以(-y)
[y(x-y)+x(x+y)-x²]/(-y)
=(XY-Y²+X²+XY-X²)/-Y
=Y-2X

化简后就能得出答案 自己算吧

解[y(x-y)+x(x+y)-x的平方]除以(-y)
=[xy-y^2+x^2+xy-x^2]除以(-y)
=[xy-y^2+xy]除以(-y)
=(2xy-y^2)/(-y)
=(y^2-2xy)/y
=y-2x