Ответ:

Приводим дроби к общему знаменателю, выполняем действие и сокращаем результат.

  1. а) \(\frac{5}{6}-\frac{1}{3}=\frac{5}{6}-\frac{2}{6}=\frac{1}{2}\).
  2. б) \(\frac{3}{4}+\frac{1}{8}=\frac{6}{8}+\frac{1}{8}=\frac{7}{8}\).
  3. в) \(\frac{9}{10}-\frac{2}{5}=\frac{9}{10}-\frac{4}{10}=\frac{1}{2}\).
  4. г) \(\frac{7}{8}-\frac{1}{4}=\frac{7}{8}-\frac{2}{8}=\frac{5}{8}\).
  5. д) \(\frac{3}{5}-\frac{1}{10}=\frac{6}{10}-\frac{1}{10}=\frac{1}{2}\).
  6. е) \(\frac{11}{20}+\frac{3}{10}=\frac{11}{20}+\frac{6}{20}=\frac{17}{20}\).
  7. ж) \(7\frac{2}{3}-3\frac{1}{6}=7\frac{4}{6}-3\frac{1}{6}=4\frac{3}{6}=4\frac{1}{2}\).
  8. з) \(6\frac{3}{8}+2\frac{1}{4}=6\frac{3}{8}+2\frac{2}{8}=8\frac{5}{8}\).
  9. и) \(10\frac{3}{5}-6\frac{1}{10}=10\frac{6}{10}-6\frac{1}{10}=4\frac{5}{10}=4\frac{1}{2}\).
  10. к) \(12\frac{5}{8}-7\frac{1}{4}=12\frac{5}{8}-7\frac{2}{8}=5\frac{3}{8}\).
  11. л) \(14\frac{1}{2}-9\frac{3}{4}=13\frac{6}{4}-9\frac{3}{4}=4\frac{3}{4}\).
  12. м) \(9\frac{2}{5}-4\frac{7}{10}=9\frac{4}{10}-4\frac{7}{10}=8\frac{14}{10}-4\frac{7}{10}=4\frac{7}{10}\).
  13. н) \(5\frac{5}{8}-4\frac{3}{5}=5\frac{25}{40}-4\frac{24}{40}=1\frac{1}{40}\).
  14. о) \(6\frac{15}{20}-2\frac{3}{5}=6\frac{3}{4}-2\frac{3}{5}=6\frac{15}{20}-2\frac{12}{20}=4\frac{3}{20}\).
  15. п) \(11\frac{7}{28}-6\frac{3}{25}=11\frac{1}{4}-6\frac{3}{25}=11\frac{25}{100}-6\frac{12}{100}=5\frac{13}{100}\).
  16. р) \(15-\frac{3}{5}=14\frac{5}{5}-\frac{3}{5}=14\frac{2}{5}\).
  17. с) \(9-5\frac{7}{10}=8\frac{10}{10}-5\frac{7}{10}=3\frac{3}{10}\).