作业帮先去括号,在合并同类项
来源：学生作业帮助网 编辑：作业帮 时间：2024/04/29 09:27:35
先去括号,在合并同类项
先去括号,在合并同类项
先去括号,在合并同类项
=x-1-2x-1 =-x-2
=3x-6+2-4x =-x-4
=4b-6a+6a-9b =-5b
=3x^2-xy-2y^2-2x^2-2xy+4y^2
=x^2-3xy+2y^2
=(x-2y)(x-y)
(1) X-1-2X-1=-X-2
(2)3X-6+2-4X=-X-4
(3)4B-6A+6A-9B=-5b
(4）3x^2-xy-2y^2-2x^-2xy+4y^2=x^2-3xy+2y^2