[(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y)

分类: 作业答案 • 2022-01-29 10:21:38

问题描述：

答

=(x-y)[(3x+y)-(2x+3y)]*(x-y)
=(x-y)*(x-y)(3x+y-2x-3y)
=(x-y)(x-y)(x-2y)
到底是化简,还是?
=(x*x-2xy+y*y)(x-2y)
=x^3-4x*x*y+5xy*y-2y^3