问题 计算题

因式分解:(x+2y)(3x﹣7y)2﹣4(x+y)2(x+2y)

答案

解:原式=(x+2y)[(3x﹣7y)2﹣4(x+y)2]

=(x+2y)[(3x﹣7y)+2(x+y)][(3x﹣7y)﹣2(x+y)]

=(x+2y)(5x﹣5y)(x﹣9y)

=5(x+2y)(x﹣y)(x﹣9y)

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