9^9m*27^2m/81^6m =3^18m*3^6m/3^24m=3^24m/3^24m=1m=n-2=>n-m=2,2n-2m=4,3n-3m=6(n-m)*(2n-2m)^3*(3n-3m)^2=2*4^3*6^2=2*64*36=4608