x²-y²+2x-2y因式分解

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x²-y²+2x-2y因式分解

(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+2)(x-y)

x²-y²+2x-2y
=(x+y)(x-y)+2(x-y)
=(x-y)(x+y+2)