Tính: 

- Hướng dẫn giải

${\left(\frac{-2}{3}\right)}^4=\frac{{(-2)}^4}{3^4}=\frac{16}{81};{\left(-\frac{1}{3}\right)}^3=\frac{{(-1)}^3}{3^3}=-\frac{1}{27}$

$\begin{array}{l}{\left(-1\frac{5}{7}\right)}^2=\left(\frac{-12}{7}\right)=\frac{144}{49};={\left(\frac{-2}{5}\right)}^5\\ =\frac{16}{625}{\left(-1,34\right)}^{\mathrm{o}};=1\end{array}$