数学题(2x-3y)²-(y+3x)(3x-y)

2023-04-27

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