分解因式:x2-xy-2y2-x-y=_.
问题描述:
分解因式:x2-xy-2y2-x-y=______.
答
x2-xy-2y2-x-y,
=(x2-xy-2y2)-(x+y),
=(x-2y)(x+y)-(x+y),
=(x+y)(x-2y-1).