a^3m=3
b^3n=2
(a^2m)^3+(b^n)^3-a^2m*b^n*a^4m*b^2n
=a^6m+b^3n-a^6m*b^3n
=(a^3m)^2+b^3n-(a^3m)^2*b^3n
=3^2+2-(3)^2*2
=9+2-18
=11-18
=-7