作业帮x²-y²+2x+2y~
来源：学生作业帮助网 编辑：作业帮 时间：2024/08/01 11:17:16
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x²-y²+2x+2y~
x²-y²+2x+2y~
x²-y²+2x+2y~
x²-y²+2x+2y=(x²-y²)+(2x+2y)
=(x-y)(x+y)+2(x+y)
=(x+y)(x-y+2)
x²-y²+2x+2y
=(x+y)(x-y)+2(x+y)
=(x+y)(x-y+2)
(x+y)(x-y+2)
是化简9y还是？
(x-1)*2-(y-1)*2
=（x+y)(x-y+2)