\[\boxed{\text{5.317.}}\]
\[3\ :5 = \frac{3}{5}\ \]
\[14\ :33 = \frac{14}{33}\ \]
\[30\ :50 = \frac{30}{50}\ \]
\[6\ :13 = \frac{6}{13}\ \]
\[Дроби\ \frac{3}{5}\ и\ \ \frac{30}{50}\ равны:\]
\[\frac{3}{5} = \frac{3 \cdot 10}{5 \cdot 10} = \frac{30}{50}\text{.\ \ }\]