3. \[\frac{8}{5} : \frac{3}{10} - \frac{1}{3} = \frac{8}{5} * \frac{10}{3} - \frac{1}{3} = \frac{80}{15} - \frac{5}{15} = \frac{75}{15} = 5\]
4. \[\frac{34}{9} : \frac{17}{54} - \frac{5}{6} = \frac{34}{9} * \frac{54}{17} - \frac{5}{6} = \frac{2*6}{1} - \frac{5}{6} = 12 - \frac{5}{6} = \frac{72}{6} - \frac{5}{6} = \frac{67}{6} = 11 \frac{1}{6}\]
Ответ: 3) 5; 4) 11 1/6