(x+y)(x-y)-(x-y)²的计算过程?

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(x+y)(x-y)-(x-y)²的计算过程?
(x+y)(x-y)-(x-y)²的计算过程?

(x+y)(x-y)-(x-y)²的计算过程?
=x²-y²-(x²-2xy+y²)
=x²-y²-x²+2xy-y²
=2xy-2y²
=2y(x-y)