Câu 1.
0,49 = $\frac{49}{100}$ = $\left ( \frac{7}{10} \right )^{2}$
$\frac{1}{32}$ = $\left ( \frac{1}{2} \right )^{5}$
$\frac{-8}{125}$ = $\left ( \frac{-2}{5} \right )^{3}$
$\frac{16}{81}$ = $\left ( \frac{2}{3} \right )^{4}$
$\frac{121}{169}$ = $\left ( \frac{11}{13} \right )^{2}$