(2x-y)²-4(x-y)(x+2y) 4(-2分之3x-3y)(2分之3x-3y)
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/28 10:59:20
![(2x-y)²-4(x-y)(x+2y) 4(-2分之3x-3y)(2分之3x-3y)](/uploads/image/z/1637495-71-5.jpg?t=%EF%BC%882x-y%EF%BC%89%26%23178%3B-4%EF%BC%88x-y%EF%BC%89%EF%BC%88x%2B2y%EF%BC%89+4%EF%BC%88-2%E5%88%86%E4%B9%8B3x-3y%EF%BC%89%EF%BC%882%E5%88%86%E4%B9%8B3x-3y%EF%BC%89)
(2x-y)²-4(x-y)(x+2y) 4(-2分之3x-3y)(2分之3x-3y)
(2x-y)²-4(x-y)(x+2y) 4(-2分之3x-3y)(2分之3x-3y)
(2x-y)²-4(x-y)(x+2y) 4(-2分之3x-3y)(2分之3x-3y)
原式=(4X²-4XY+Y²)-4(X²+XY-2Y²)-4(9/4X²-9XY+9Y²)
=4X²-4XY+Y²-4X²-4XY+8Y²-9X²+36XY-36Y²
=-9X²+28XY-27Y².