Question

Sa se calculeze: (5/2)⁻¹ - ∛8/125.

Answer 1

$\displaystyle \left( \frac{5}{2} \right)^{-1}- \sqrt[3]{ \frac{8}{125} } = \frac{2}{5} - \frac{ \sqrt[3]{8} }{ \sqrt[3]{125} } = \frac{2}{5} - \frac{ \sqrt[3]{2^3} }{ \sqrt[3]{5^3} } = \frac{2}{5} - \frac{2}{5} =0$