x²-xy-2y²-x-y 因式分解

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x²-xy-2y²-x-y 因式分解

x²-xy-2y²-x-y
=(x-2y)(x+y)-(x+y)
=(x+y)(x-2y-1)

原式=(x-2y)(x+y)-(x+y)
=(x+y)(x-2y-1)

x²-xy-2y²-x-y
=(x+y)(x-2y)-(x+y)
=(x+y)(x-2y-1)