x^2-xy-2y^2-x+5y-2因式分解都做做吧
问题描述：
x^2-xy-2y^2-x+5y-2因式分解都做做吧
答
原式=(x-2y)(x+y)-x+5y-2
=(x-2y)(x+y)+(x+y)-2x+4y-2
=(x+y)(x-2y+1)-2(x-2y+1)
=(x+y-2)(x-2y+1)