Ответ:
\[\left(\frac{5m^{-4}}{6n^{-1}}\right)^{-3}=\left(\frac{5n}{6m^4}\right)^{-3}=\left(\frac{6m^4}{5n}\right)^3=\frac{216m^{12}}{125n^3}.\]
\[\frac{216m^{12}}{125n^3}\cdot125m^{-10}n^2=216m^2n^{-1}=\frac{216m^2}{n}.\]
Ответ: \(\frac{216m^2}{n}\).
