\[\boxed{\mathbf{199\ }\left( \mathbf{199} \right)\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
Пояснение.
Решение.
\[1)\ \frac{a}{6} = \frac{9}{54}\]
\[\frac{a}{6} = \frac{1}{6} \Longrightarrow a = 1.\]
\[2)\ \frac{7}{a} = \frac{49}{28}\]
\[\frac{7}{a} = \frac{7}{4} \Longrightarrow a = 4.\]
\[3)\ \frac{27}{45} = \frac{3}{a}\]
\[\frac{3}{a} = \frac{3}{5} \Longrightarrow a = 5.\]
\[4)\ \frac{a}{32} = \frac{5}{8}\]
\[\frac{a}{32} = \frac{20}{32} \Longrightarrow a = 20.\]