\[\boxed{\mathbf{727\ (727).}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\textbf{а)}\ 2\ :5 = \frac{2}{5}\]
\[\textbf{б)}\ 3\ :8 = \frac{3}{8}\]
\[\textbf{в)}\ 5\ :9 = \frac{5}{9}\]
\[\textbf{г)}\ 7\ :4 = \frac{7}{4}\]
\[\textbf{д)}\ 4\ :3 = \frac{4}{3}\]
\[\textbf{е)}\ 1\ :6 = \frac{1}{6}\]
\[\textbf{ж)}\ 19\ :10 = \frac{19}{10}\]
\[\textbf{з)}\ 10\ :11 = \frac{10}{11}\]