\( 4^{-10} \cdot (4^3)^4 = 4^{-10} \cdot 4^{12} = 4^{(-10+12)} = 4^2 = 16 \)
\( \frac{3^8 \cdot 3^{-9}}{3^{-5}} = \frac{3^{8-9}}{3^{-5}} = \frac{3^{-1}}{3^{-5}} = 3^{-1 - (-5)} = 3^{-1+5} = 3^4 = 81 \)
\( \frac{16}{81} \)
Ответ: \( \frac{16}{81} \).