Ответ:
\[\left(\frac{125}{8}\right)^{\frac{2}{3}}=\left(\sqrt[3]{\frac{125}{8}}\right)^2=\left(\frac{5}{2}\right)^2=\frac{25}{4}.\]
\[\left(\frac{25}{4}\right)^{-\frac{1}{2}}=\left(\frac{4}{25}\right)^{\frac{1}{2}}=\frac{2}{5}.\]
Ответ: \(\frac{2}{5}\)
