因式分解:(x+y)²-(x-y)²

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因式分解:(x+y)²-(x-y)²

因式分解:(x+y)²-(x-y)²
因式分解:(x+y)²-(x-y)²

因式分解:(x+y)²-(x-y)²
(x+y)²-(x-y)²
=[(x+y)+(x-y)][(x+y)-(x-y)]
=(2x)(2y)
=4xy

[x+y+x-y][x+y-x+y]=4xy