因式分解：x×x-xy-2y×y-x-y

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因式分解：x×x-xy-2y×y-x-y因式分解：x×x-xy-2y×y-x-y因式分解：x×x-xy-2y×y-x-y(x+y)(x-y)-x(y+1)-y(y+1)=(x+y)(x-y)-(x+y

因式分解：x×x-xy-2y×y-x-y
因式分解：x×x-xy-2y×y-x-y

因式分解：x×x-xy-2y×y-x-y
(x+y)(x-y)-x(y+1)-y(y+1)
=(x+y)(x-y)-(x+y)(y+1)
=(x+y)(x-2y-1)

x^2-xy-2y^2-x-y
=(x-2y)(x+y)-(x+y)
=(x+y)(x-2y-1)

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