(3x^4 + 2y^2)^3= (3x^4)^3 + 3(3x^4)^2(2y^2) + 3(3x^4)(2y^2)^2 + (2y^2)^3 = 27x^12+
+ 54x^8y^2 + 36x^4y^4 + 8y^6
(a^2m - b^3n)^3 = a^6m - 3(a^2m)^2b^3n + 3a^2m(b^3n)^2 - b^9n=a^6m -
-3a^4mb^3n + 3a^2mb^6n - b^9n
(3n + 4^m-1)^3 = 27n^3 + 3*9n^2*4^m-1 + 3*3n*4^2(m-1) + 4^3(m-1) =
= 27n^3 + 27n^24^m-1 + 9n*4^2(m-1) + 4^3(m-1)