Вычислите (9⁻⁴ ⋅ 9⁻⁵) / (9⁻⁶ ⋅ 9⁻⁶)

(9^-4 ⋅ 9^-5) / (9^-6 ⋅ 9^-6) = 9^-4-5 / 9^-6-6 = 9^-9 / 9^-12 = 9^{-9 - (-12)} = 9^{-9 + 12} = 9³ = 729