\[\boxed{\text{6.19.}}\]
\[\textbf{а)}\ 1\frac{1}{3} = \frac{4}{3};\ \]
\[\textbf{б)}\ 3\frac{7}{10} = \frac{37}{10};\ \]
\[\textbf{в)}\ 18\frac{6}{7} = \frac{132}{7};\ \]
\[\textbf{г)}\ 11\frac{11}{30} = \frac{341}{30};\ \]
\[\textbf{д)}\ 8\frac{3}{10} = \frac{83}{10}\text{.\ }\]