-3x2+2x2y+xy2
问题描述：
-3x2+2x2y+xy2
答
-3x2+2x2y+xy2
=-3x²+3x²y-x²y+xy²
=3x²(y-1)+xy(y-1)
=(3x²+xy)(y-1)
=x(3x+y)(y-1)