Вычислите (1-2): 1. a) \(\frac{5}{6}+(-\frac{7}{12})\); 6) \(-\frac{5}{9}-\frac{1}{12}\); B) \(-\frac{14}{25} \cdot \frac{20}{21}\); г) \(\frac{13}{28}:(-\frac{11}{14})\). 2. \(-\frac{5}{16} \cdot \frac{4}{7} - \frac{21}{32}:(-\frac{9}{4})\).

1. a) \(\frac{5}{6}+(-\frac{7}{12})\) = \(\frac{5}{6}-\frac{7}{12}\) = \(\frac{10}{12}-\frac{7}{12}\) = \(\frac{3}{12}\) = \(\frac{1}{4}\)

1. б) \(-\frac{5}{9}-\frac{1}{12}\) = \(\frac{-20}{36}-\frac{3}{36}\) = \(\frac{-23}{36}\)

1. в) \(-\frac{14}{25} \cdot \frac{20}{21}\) = \(-\frac{2}{5} \cdot \frac{4}{3}\) = \(\frac{-8}{15}\)

1. г) \(\frac{13}{28}:(-\frac{11}{14})\) = \(\frac{13}{28} \cdot (-\frac{14}{11})\) = \(\frac{13}{2} \cdot (-\frac{1}{11})\) = \(\frac{-13}{22}\)

2. \(-\frac{5}{16} \cdot \frac{4}{7} - \frac{21}{32}:(-\frac{9}{4})\) = \(-\frac{5}{4} \cdot \frac{1}{7} - \frac{21}{32} \cdot (-\frac{4}{9})\) = \(-\frac{5}{28} + \frac{7}{8} \cdot \frac{1}{3} \) = \(-\frac{5}{28} + \frac{7}{24} \) = \(\frac{-30+49}{168}\) = \(\frac{19}{168}\)