\[\boxed{\text{5.374.}}\]
\[3\frac{1}{2}\ и\ 1\frac{1}{18}:\ \]
\[1)\ 3\frac{1}{2} = 3\frac{9}{18};\ \ \ \ 1\frac{1}{18}\text{.\ }\]
\[2)\ 3\frac{9}{18} - 1\frac{1}{18} = 2\frac{8}{18}\text{.\ \ }\]
\[3)\ 2\frac{8}{18} = 2\frac{4}{9}\text{.\ \ \ }\]