Đáp án:
$\begin{array}{l}
\dfrac{{{5^3}{{.7}^3}.13}}{{{{65.35}^3}}} = \dfrac{{{5^3}{{.7}^3}.13}}{{{{13.5.5}^3}{{.7}^3}}} = \dfrac{1}{5}\\
\dfrac{{{3^5}.17 + {3^5}.13}}{{{9^2}{{.5}^2}}} = \dfrac{{{3^5}.\left( {17 + 13} \right)}}{{{3^{2.2}}.25}}\\
= \dfrac{{{3^5}.30}}{{{3^4}.25}} = \dfrac{{3.6}}{5} = \dfrac{{18}}{5}
\end{array}$