x²-xy-2y²-x-y 因式分解

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x²-xy-2y²-x-y 因式分解

X^2-Xy-2Y^2-X-y=X^2-Y^2-Xy-2Y^2-X-y=(x+y)(x-y)-y(x+y)-(x+y)=(x+y)(x-y-y-1)=(x+y)(x-2y-1)