x^2-xy-2y^2-x+5y-2因式分解都做做吧_数学解答

x^2-xy-2y^2-x+5y-2因式分解都做做吧

人气：441 ℃　时间：2020-03-11 22:06:25

解答

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)