Вычисли выражения с дробями.

Конечно, помогу! 6) $\left(\frac{5}{9} + \frac{2}{3}\right) : 11 = \left(\frac{5}{9} + \frac{6}{9}\right) : 11 = \frac{11}{9} : 11 = \frac{11}{9} \cdot \frac{1}{11} = \frac{1}{9}$ г) $\left(\frac{9}{13} - \frac{9}{39}\right) : 9 = \left(\frac{27}{39} - \frac{9}{39}\right) : 9 = \frac{18}{39} : 9 = \frac{18}{39} \cdot \frac{1}{9} = \frac{2}{39}$ e) $\left(\frac{7}{12} + \frac{5}{36}\right) : 13 = \left(\frac{21}{36} + \frac{5}{36}\right) : 13 = \frac{26}{36} : 13 = \frac{13}{18} \cdot \frac{1}{13} = \frac{1}{18}$ 572. a) $\left(\frac{1}{2} + \frac{1}{5}\right) : 2 - \frac{3}{10} = \left(\frac{5}{10} + \frac{2}{10}\right) : 2 - \frac{3}{10} = \frac{7}{10} : 2 - \frac{3}{10} = \frac{7}{20} - \frac{3}{10} = \frac{7}{20} - \frac{6}{20} = \frac{1}{20}$ в) $\left(\frac{7}{15} + \frac{4}{5}\right) : 3 - \frac{1}{9} = \left(\frac{7}{15} + \frac{12}{15}\right) : 3 - \frac{1}{9} = \frac{19}{15} : 3 - \frac{1}{9} = \frac{19}{45} - \frac{1}{9} = \frac{19}{45} - \frac{5}{45} = \frac{14}{45}$ б) $\left(\frac{3}{4} - \frac{5}{12}\right) \cdot 8 + \frac{1}{18} = \left(\frac{9}{12} - \frac{5}{12}\right) \cdot 8 + \frac{1}{18} = \frac{4}{12} \cdot 8 + \frac{1}{18} = \frac{1}{3} \cdot 8 + \frac{1}{18} = \frac{8}{3} + \frac{1}{18} = \frac{48}{18} + \frac{1}{18} = \frac{49}{18}$ г) $\left(\frac{3}{7} - \frac{1}{21}\right) \cdot 14 - \frac{1}{6} = \left(\frac{9}{21} - \frac{1}{21}\right) \cdot 14 - \frac{1}{6} = \frac{8}{21} \cdot 14 - \frac{1}{6} = \frac{8 \cdot 2}{3} - \frac{1}{6} = \frac{16}{3} - \frac{1}{6} = \frac{32}{6} - \frac{1}{6} = \frac{31}{6}$