Ответ:

  1. а) \(8-3\frac{6}{7}=7\frac{7}{7}-3\frac{6}{7}=4\frac{1}{7}\).
  2. б) \(2\frac{1}{8}+3\frac{5}{12}=5+\frac{3}{24}+\frac{10}{24}=5\frac{13}{24}\).
  3. в) \(5\frac{13}{15}+1\frac{7}{12}=6+\frac{52}{60}+\frac{35}{60}=7\frac{27}{60}=7\frac{9}{20}\).
  4. г) \(7\frac{3}{8}-3\frac{5}{6}=7\frac{9}{24}-3\frac{20}{24}=6\frac{33}{24}-3\frac{20}{24}=3\frac{13}{24}\).
  5. д) \(\frac{3}{7}:\frac{5}{11}=\frac{3}{7}\cdot\frac{11}{5}=\frac{33}{35}\).
  6. е) \(\frac{6}{25}\cdot\frac{5}{18}=\frac{1}{15}\).
  7. ж) \(2\frac{1}{10}\cdot1\frac{1}{14}=\frac{21}{10}\cdot\frac{15}{14}=\frac{9}{4}=2\frac{1}{4}\).
  8. з) \(3\frac{3}{5}\cdot1\frac{1}{9}=\frac{18}{5}\cdot\frac{10}{9}=4\).
  9. и) \(1\frac{3}{7}\cdot14=\frac{10}{7}\cdot14=20\).
  10. к) \(\frac{5}{7}:\frac{3}{8}=\frac{5}{7}\cdot\frac{8}{3}=\frac{40}{21}=1\frac{19}{21}\).
  11. л) \(\frac{5}{9}:\frac{10}{27}=\frac{5}{9}\cdot\frac{27}{10}=1\frac{1}{2}\).
  12. м) \(4\frac{4}{9}:2\frac{2}{3}=\frac{40}{9}:\frac{8}{3}=\frac{40}{9}\cdot\frac{3}{8}=1\frac{2}{3}\).
  13. н) \(32\cdot\frac{8}{9}=\frac{256}{9}=28\frac{4}{9}\).
  14. о) \(\frac{12}{13}:6=\frac{12}{13}\cdot\frac{1}{6}=\frac{2}{13}\).