27^-1 9^1 / 16^0 3^-1 = (3^3)^-1 (3^2)^1 / (4^2)^0 (3^1)^-1 = 3^-3 3^2 / 1 3^-1 = 3^(-3 + 2 - 1) = 3^-2 = 1/9
27^-1 9^1 / 16^0 3^-1 = (3^3)^-1 (3^2)^1 / (4^2)^0 (3^1)^-1 = 3^-3 3^2 / 1 3^-1 = 3^(-3 + 2 - 1) = 3^-2 = 1/9