Question

gente não sei fazer esse trabalho me ajudem pfvr ( vejam a foto)

Answer 1

Olá, Mariana.

$\text{a)}\sqrt[8]{\frac{1}{8}}+\sqrt[8]{\frac{1}{64}}+\sqrt[8]{\frac{1}{27}}=\\\\ =\frac{1}{\sqrt[8]{8}}+\frac{1}{\sqrt[8]{64}}+\frac{1}{\sqrt[8]{27}}=\\\\ =\frac{\sqrt[8]{8}}8+\frac{\sqrt[8]{64}}{64}+\frac{\sqrt[8]{27}}{27}\\\\\\ \text{b)}\sqrt{\frac{25}{9}}-\sqrt{\frac{49}{9}}=\\\\ =\frac53-\frac73=\\\\ =\frac{5-7}3=\\\\ =-\frac23$