x²-xy-2y²-x-y 因式分解
问题描述:
x²-xy-2y²-x-y 因式分解
答
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)
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)