2(x-y)^2+4(x-y)(x+y)
问题描述：
2(x-y)^2+4(x-y)(x+y)
答
2(x-y)^2+4(x-y)(x+y)
提取2（x-y）得
=2(x-y)(x-y+2x+2y)
=2(x-y)(3x+y)
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