Question

Calcule: (me ajudem, por favor)

Answer 1

$a)\ \frac{4}{5} \cdot\sqrt{2,56}=\frac{4}{5} \cdot\sqrt{\frac{256}{100} }=\frac{4}{5} \cdot\frac{\sqrt{256}}{\sqrt{100} }=\frac{4}{5} \cdot\frac{16}{10}=\frac{64^{:2}}{50_{:2}}= \frac{32}{25}$

$b)\ \sqrt[3]{-\frac{8}{27} } +\sqrt{\frac{25}{64} } =-\frac{2}{3} +\frac{5}{8} =-\frac{16}{24} +\frac{15}{24} =\frac{-16+15}{24} =-\frac{1}{24}$