\[\boxed{\mathbf{1129}\mathbf{.}\mathbf{\ }}\]
\[1)\ \frac{3}{5} \Longrightarrow \frac{5}{3}\]
\[2)\ 12 \Longrightarrow \frac{1}{12}\]
\[3)\ 3\frac{2}{9} = \frac{29}{9} \Longrightarrow \frac{9}{29}\]
\[4)\ \frac{1}{17} \Longrightarrow \frac{17}{1}\]