(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
(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）