\[\boxed{\text{5.248.}}\]
\[\textbf{а)}\ 5\ :2 = \frac{5}{2} = 2\frac{1}{2}\ \]
\[\textbf{б)}\ 17\ :6 = \frac{17}{6} = 2\frac{5}{6}\ \]
\[\textbf{в)}\ 40\ :9 = \frac{40}{9} = 4\frac{4}{9}\ \]
\[\textbf{г)}\ 49\ :10 = \frac{49}{10} = 4\frac{9}{10}\ \]
\[\textbf{д)}\ 268\ :33 = \frac{268}{33} = 8\frac{4}{33}\ \]
\[\textbf{е)}\ 499\ :28 = \frac{499}{28} = 17\frac{23}{28}\ \]
\[\textbf{ж)}\ 561\ :100 = \frac{561}{100} = 5\frac{61}{100}\ \]
\[\textbf{з)}\ 1024\ :1000 = \frac{1024}{1000} =\]
\[= 1\frac{24}{1000}\]