Вычислите: 3/16 * (4/5 + 8/15).

9. $\frac{3}{16} \cdot (\frac{4}{5} + \frac{8}{15}) = \frac{3}{16} \cdot (\frac{12}{15} + \frac{8}{15}) = \frac{3}{16} \cdot \frac{20}{15} = \frac{3}{16} \cdot \frac{4}{3} = \frac{1}{4}$. **Ответ: 0,25** 10. $\frac{8}{35} \cdot (\frac{5}{6} + \frac{11}{12}) = \frac{8}{35} \cdot (\frac{10}{12} + \frac{11}{12}) = \frac{8}{35} \cdot \frac{21}{12} = \frac{2}{5} \cdot \frac{3}{3} = \frac{2}{5} = 0,4$. **Ответ: 0,4** 11. $\frac{8}{15} \cdot (\frac{7}{8} + \frac{11}{16}) = \frac{8}{15} \cdot (\frac{14}{16} + \frac{11}{16}) = \frac{8}{15} \cdot \frac{25}{16} = \frac{1}{3} \cdot \frac{5}{2} = \frac{5}{6}$. **Ответ: 5/6** 12. $\frac{9}{10} \cdot (\frac{11}{12} - \frac{2}{9}) = \frac{9}{10} \cdot (\frac{33}{36} - \frac{8}{36}) = \frac{9}{10} \cdot \frac{25}{36} = \frac{1}{2} \cdot \frac{5}{4} = \frac{5}{8}$. **Ответ: 0,625** 13. $\frac{7}{39} \cdot (\frac{11}{14} - \frac{1}{6}) = \frac{7}{39} \cdot (\frac{33}{42} - \frac{7}{42}) = \frac{7}{39} \cdot \frac{26}{42} = \frac{1}{3} \cdot \frac{2}{6} = \frac{1}{3} \cdot \frac{1}{3} = \frac{1}{9}$. **Ответ: 1/9** 14. $\frac{24}{49} : \frac{6}{7} + \frac{1}{14} = (\frac{24}{49} \cdot \frac{7}{6}) + \frac{1}{14} = \frac{4}{7} + \frac{1}{14} = \frac{8}{14} + \frac{1}{14} = \frac{9}{14}$. **Ответ: 9/14** 15. $\frac{5}{6} - \frac{4}{9} : \frac{16}{21} = \frac{5}{6} - (\frac{4}{9} \cdot \frac{21}{16}) = \frac{5}{6} - (\frac{1}{3} \cdot \frac{7}{4}) = \frac{5}{6} - \frac{7}{12} = \frac{10}{12} - \frac{7}{12} = \frac{3}{12} = \frac{1}{4}$. **Ответ: 0,25** 16. $\frac{8}{9} - \frac{3}{8} : \frac{27}{28} = \frac{8}{9} - (\frac{3}{8} \cdot \frac{28}{27}) = \frac{8}{9} - (\frac{1}{2} \cdot \frac{7}{9}) = \frac{8}{9} - \frac{7}{18} = \frac{16}{18} - \frac{7}{18} = \frac{9}{18} = \frac{1}{2}$. **Ответ: 0,5**