题目

因式分解:(x+y)2(x﹣y)﹣(x+y)(x﹣y)2 . 答案:解:(x+y)2(x﹣y)﹣(x+y)(x﹣y)2=(x+y)(x﹣y)[(x+y)﹣(x﹣y)]=2y(x+y)(x﹣y).
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