因式分解-3x(y²-1)+3y(x²-1)

问题描述:

因式分解-3x(y²-1)+3y(x²-1)

-3x(y²-1)+3y(x²-1)
= -3xy²+3x+3yx²-3y
=3[xy(x-y)+(x-y)]
=3(x-y)(xy+1)