Вычисли значения выражений: 7/9 - 5/6 * 4/15, (2/3 - 4/9) * 3/8, 2/7 + 3/8 : 7/32, 5/9 : (7/9 + 11/18), 1 - 4/7 : 16/21, 5/12 : (1/5 + 3/25)

1. $\frac{7}{9} - \frac{5}{6} \cdot \frac{4}{15} = \frac{7}{9} - \frac{2}{9} = \frac{5}{9}$ **Ответ: $\frac{5}{9}$** 2. $(\frac{2}{3} - \frac{4}{9}) \cdot \frac{3}{8} = (\frac{6}{9} - \frac{4}{9}) \cdot \frac{3}{8} = \frac{2}{9} \cdot \frac{3}{8} = \frac{1}{12}$ **Ответ: $\frac{1}{12}$** 3. $\frac{2}{7} + \frac{3}{8} : \frac{7}{32} = \frac{2}{7} + \frac{3}{8} \cdot \frac{32}{7} = \frac{2}{7} + \frac{12}{7} = \frac{14}{7} = 2$ **Ответ: 2** 4. $\frac{5}{9} : (\frac{7}{9} + \frac{11}{18}) = \frac{5}{9} : (\frac{14}{18} + \frac{11}{18}) = \frac{5}{9} : \frac{25}{18} = \frac{5}{9} \cdot \frac{18}{25} = \frac{2}{5}$ **Ответ: $\frac{2}{5}$** 5. $1 - \frac{4}{7} : \frac{16}{21} = 1 - \frac{4}{7} \cdot \frac{21}{16} = 1 - \frac{3}{4} = \frac{1}{4}$ **Ответ: $\frac{1}{4}$** 6. $\frac{5}{12} : (\frac{1}{5} + \frac{3}{25}) = \frac{5}{12} : (\frac{5}{25} + \frac{3}{25}) = \frac{5}{12} : \frac{8}{25} = \frac{5}{12} \cdot \frac{25}{8} = \frac{125}{96}$ **Ответ: $\frac{125}{96}$**