分解因式：x²-y²+2x-2y
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分解因式：x²-y²+2x-2y分解因式：x²-y²+2x-2y分解因式：x²-y²+2x-2yx²-y²+2x-2y=
分解因式：x²-y²+2x-2y
分解因式：x²-y²+2x-2y
分解因式：x²-y²+2x-2y
x²-y²+2x-2y
=(x+y)(x-y)+2(x-y)
=(x-y)(x+y+2)
(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(x-y）
=(x-y)(x+y+2)