因式分解(x+2y)(3x^2-4y^2)-(x+2y)^2(x-2y)

来源：学生作业帮编辑：神马作文网作业帮分类：数学作业时间：2024/11/18 01:54:02

(x+2y)(3x^2-4y^2)-(x+2y)^2(x-2y)
=(x+2y)[(3x^2-4y^2)-(x+2y)(x-2y)]
=(x+2y)[(3x^2-4y^2)-(x^2-4y^2)]
=(x+2y)(3x^2-4y^2-x^2+4y^2)
=2(x+2y)x^2

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