3x-12y-x^2+8xy-16y^2

问题描述:

3x-12y-x^2+8xy-16y^2
因式分解

原式=3(x-4y)-(x^2-8xy+16y^2)
=3(x-4y)-(x-4y)^2
=(x-4y)(3-x+4y)