\[\boxed{\mathbf{1147}\mathbf{.}\mathbf{\ }}\]
\[1)\ \frac{7^{\backslash 2}}{18} + \frac{7^{\backslash 3}}{12} = \frac{14 + 21}{36} =\]
\[= \frac{35}{36} \Longrightarrow \frac{36}{35}\]