\[\boxed{\mathbf{201\ }\left( \mathbf{201} \right)\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
Пояснение.
Решение.
\[1)\ \frac{x + 3}{65} = \frac{4}{13}\text{\ \ \ \ \ }\]
\[\frac{x + 3}{65} = \frac{20}{65}\text{\ \ \ }\]
\[x + 3 = 20\ \ \ \ \ \]
\[x = 17\]
\[Ответ:17.\]
\[2)\ \frac{7}{x + 4} = \frac{21}{60}\text{\ \ \ \ \ \ }\]
\[\frac{7}{x + 4} = \frac{7}{20}\text{\ \ \ }\]
\[x + 4 = 20\ \ \]
\[\ x = 16\]
\[Ответ:16.\]
\[3)\ \frac{5x - 8}{5} = \frac{18}{45}\text{\ \ \ \ }\]
\[\frac{5x - 8}{5} = \frac{2}{5}\text{\ \ }\]
\[5x - 8 = 2\ \ \]
\[5x = 10\ \ \ \]
\[x = 2\]
\[Ответ:2.\]
\[\boxed{\mathbf{201}\mathbf{.}}\]
\[1)\ 5 + 2 = 7\ см.\]
\[2)\ 5 - 2 = 3\ см.\]