因式分解：(x-y)(3x-7y)²-4(x-y)(x+y)²

来源：学生作业帮编辑：拍题作业网作业帮分类：数学作业时间：2024/04/27 23:43:08

(x-y)(3x-7y)²-4(x-y)(x+y)²
=(x-y)[(3x-7y)²-4(x+y)²]
=(x-y)(3x-7y-2x-2y)(3x-7y+2x+2y)
=(x-y)(x-9y)(5x-5y)
=5(x-y)²(x-9y)

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