x²-y²+2x+2y~
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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)