计算:(x-y)^2-(x+y)(x-y)
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计算:(x-y)^2-(x+y)(x-y)计算:(x-y)^2-(x+y)(x-y)计算:(x-y)^2-(x+y)(x-y)2y(y-x)x=yx^2-2xy+y^2-x^2+y^2=2y^2-2x
计算:(x-y)^2-(x+y)(x-y)
计算:(x-y)^2-(x+y)(x-y)
计算:(x-y)^2-(x+y)(x-y)
2y(y-x)
x=y
x^2-2xy+y^2-x^2+y^2
=2y^2-2xy
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