$\sqrt{5^3}$\sqrt{5^3}

$\displaystyle \frac{1}{\sqrt{5^3}}$\displaystyle \frac{1}{\sqrt{5^3}}

$\sqrt[3]{5^2}$\sqrt[3]{5^2}

$\displaystyle \frac{1}{\sqrt[3]{5^2}}$\displaystyle \frac{1}{\sqrt[3]{5^2}}