$\displaystyle \left( \frac{1}{25} \right)^{- \frac{1}{2} }$\displaystyle \left( \frac{1}{25} \right)^{- \frac{1}{2} }

$\displaystyle \left( \frac{1}{25} \right)^{- \frac{1}{5} }$\displaystyle \left( \frac{1}{25} \right)^{- \frac{1}{5} }

$\displaystyle 125^{ \frac{2}{3} }$\displaystyle 125^{ \frac{2}{3} }

$\displaystyle 125^{ \frac{1}{3} }$\displaystyle 125^{ \frac{1}{3} }