(2x+y)²-(x+2y)²

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(2x+y)²-(x+2y)²
(2x+y)²-(x+2y)²

(2x+y)²-(x+2y)²
平方差
原式=(2x+y+x+3y)(2x+y-x-2y)
=(3x+3y)(x-y)
=3(x+y)(x-y)

3(x-y)(x+y)