x+y+z-3xyz怎么因式分解?
问题描述：
x+y+z-3xyz怎么因式分解?
答
x+y+z-3xyz
=x+3xy+3xy+y+z-3xy-3xy-3xyz
=(x+y)+z-3xy(x+y+z)
=(x+y+z)(x+2xy+y-xz-yz-3xy)
=(x+y+z)(x+y+z-xy-yz-xz)