因式分解题 x^2-xy-2y^2-x-y

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因式分解题x^2-xy-2y^2-x-y因式分解题x^2-xy-2y^2-x-y因式分解题x^2-xy-2y^2-x-yx^2-xy-2y^2-x-y=(x^2-xy-2y^2)-(x+y)=(x-2

因式分解题 x^2-xy-2y^2-x-y
因式分解题 x^2-xy-2y^2-x-y

因式分解题 x^2-xy-2y^2-x-y
x^2-xy-2y^2-x-y
=(x^2-xy-2y^2)-(x+y)
=(x-2y)(x+y)-(x+y)
=(x+y)(x-2y-1)

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