Question

(FGV) O valor de $\frac{2}{3} .8^{ \frac{2}{3} }- \frac{2}{3}. 8^{ \frac {-2}{3} }$

Answer 1

$\frac{2}{3} . \sqrt[3]{ 8^{2} } - \frac{2}{3} . \sqrt[3]{ 8^{-2} } = \frac{2}{3} . 4 - \frac{2}{3} . \frac{1}{4} = \frac{8}{3} - \frac{1}{6} = \frac{15}{6}$