\[\boxed{\mathbf{1382}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ 4\ \% = \frac{4}{100} = \frac{1}{25}.\]
\[2)\ 50\ \% = \frac{50}{100} = \frac{1}{2}.\]
\[3)\ 12\ \% = \frac{12}{100} = \frac{3}{25}.\]
\[4)\ \frac{1}{3}\ \% = \frac{\frac{1}{3}}{100} = \frac{1}{3} \cdot \frac{1}{100} = \frac{1}{300}.\]
\[5)\ \frac{5}{7}\ \% = \frac{\frac{5}{7}}{100} = \frac{5}{7} \cdot \frac{1}{100} =\]
\[= \frac{1}{7} \cdot \frac{1}{20} = \frac{1}{140}.\]
\[6)\ 2\frac{3}{8}\ \% = \frac{19}{8}\ \% = \frac{\frac{19}{8}}{100} =\]
\[= \frac{19}{8} \cdot \frac{1}{100} = \frac{19}{800}.\]
\[7)\ 5\frac{2}{9}\ \% = \frac{47}{9}\ \% = \frac{\frac{47}{9}}{100} =\]
\[= \frac{47}{9} \cdot \frac{1}{100} = \frac{47}{900}.\]
\[8)\ 104\frac{1}{3}\ \% = \frac{313}{3}\ \% = \frac{\frac{313}{3}}{100} =\]
\[= \frac{313}{3} \cdot \frac{1}{100} = \frac{313}{300} = 1\frac{13}{300}\text{.\ \ }\]