x^2y+3xy^2-x-3y因式分解
问题描述：
x^2y+3xy^2-x-3y因式分解
答
(x+3y)(xy-1)
答
=xy(x+3y)-(x+3y)
=(xy-1)(x+3y)
答
x²y+3xy²-x-3y
=xy(x+3y)-(x+3y)
=(x+3y)(xy-1)