2x^2+xy-6x^2+5x-4y+2

问题描述:

2x^2+xy-6x^2+5x-4y+2

2x^2+xy-6y^2+5x-4y+2
=(2x-3y)(x+2y)+5x-4y+2
=(2x-3y)(x+2y)+2(2x-3y)+(x+2y)+2
=(2x-3y+1)(x+2y+2)