Question

$4 * 8^{- \frac{2}{3} } - 25 * 625^{- \frac{3}{4} } = ?$

Answer 1

$\frac{4}{8^ \frac{2}{3} }- \frac{25}{625^ \frac{3}{4} }= \frac{4}{ \sqrt[3]{2^6} }- \frac{25}{ \sqrt[4]{ 5^{12} } }= \frac{4}{ 2^{2} } - \frac{25}{5^3} = \frac{4}{4} - \frac{25}{125} =1- \frac{1}{5}= \frac{4}{5}$