因式分解x^2+xy-2y^2-x-4y-2_数学解答

因式分解x^2+xy-2y^2-x-4y-2

人气：471 ℃　时间：2020-03-11 19:35:16

解答

题目错了
x^2+xy-2y^2+x-4y-2
=(x+2y)(x-y)+(x-4y)-2
=(x+2y+2)(x-y-1)
x^2+xy-2y^2-x+4y-2
=(x+2y)(x-y)-(x-4y)-2
=(x+2y-2)(x-y+1)