6(x+y)²-2(x-y)(x+y)因式分解

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6(x+y)²-2(x-y)(x+y)因式分解

6(x+y)²-2(x-y)(x+y)
=2(x+y)[3(x+y)-(x-y)]
=2(x+y)(2x+4y)
=4(x+y)(x+2y)