\[\left( - \frac{4}{5}a^{- 5}b^{- 12} \right)^{- 3} \cdot \left( 5a^{9}b^{17} \right)^{- 2} =\]
\[= \left( - \frac{5}{4} \right)^{3}a^{15}b^{36} \cdot \left( \frac{1}{5a^{9}b^{17}} \right)^{2} =\]
\[= - \frac{125}{64} \cdot \frac{1}{25} \cdot a^{15}b^{36} \cdot \frac{1}{a^{18}b^{34}} =\]
\[= - \frac{5b^{2}}{64a^{3}}.\]