因式分解x^2+xy-2y^2-x+7x-6急阿

分类: 作业答案 • 2021-12-19 11:26:08

问题描述：

因式分解x^2+xy-2y^2-x+7x-6
急阿

答

x^2+xy-2y^2-x+7y-6
=(x+2y)(x-y)-x+7y-6
=(x+2y)(x-y)+2x+4y-3x+3y-6
=(x+2y)(x-y)+2(x+2y)-3(x-y)-6
=(x+2y-3)(x-y+2)