因式分解(1)4(x+y)2-(x-y)2；(2)x2y-xy2+x3-y3．
因式分解(1)4(x+y)2-(x-y)2；(2)x2y-xy2+x3-y3．
【正确答案】：(1)(3x+y)(x+3y)(2)(x-y)(x+y)2
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