Question

(2m-3n)в третей степени

Answer 1

Формула: (a-b)^3=a^3-3a^2b+3ab^2-b^3
(2m-3n)^3=(2m)^3-3(2m)^2*3n+3*2m*(3n)^2-(3n)^3=
=8m^3-3*4m^2*3n+3*2m*9n^2-27n^3=8m^3-36m^2*n+54mn^2-27n^3