x²-y²+2x+2y~

来源：学生作业帮助网编辑：作业帮时间：2024/05/05 19:42:44

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)