6x2-5xy-6y2+2x+23y-20.
问题描述:
6x2-5xy-6y2+2x+23y-20.
答
6x2-5xy-6y2+2x+23y-20
=6x2-x(5y-2)-(6y2-23y+20),
=6x2-x(5y-2)-(2y-5)(3y-4),
=(2x-3y+4)(3x+2y-5).