m^3n-2m^2n^2+mn^3

问题描述:

m^3n-2m^2n^2+mn^3

m^3n-2m^2n^2+mn^3
=mn(m^2-2mn+n^2)
=mn(m-n)^2.

m^3n-2m^2n^2+mn^3
=mn(m^2-2mn+n^2)
=mn(m-n)^2