数学题(2x-3y)²-(y+3x)(3x-y) 答案网 2022-04-21 阅读(0) 数学题(2x-3y)²-(y+3x)(3x-y) 问题描述: 数学题(2x-3y)²-(y+3x)(3x-y)最佳答案: (2x-3y)²-(y+3x)(3x-y) =4x^2-12xy+9y^2-9x^2+y^2= -5x^2-12xy+10y^2