Ответ:

  1. Приводим к общему знаменателю: \(\frac{3}{5}-\frac{1}{2}=\frac{6}{10}-\frac{5}{10}=\frac{1}{10}\).
  2. Преобразуем смешанные числа в неправильные дроби: \(2\frac{1}{3}-1\frac{5}{6}=\frac{7}{3}-\frac{11}{6}=\frac{14}{6}-\frac{11}{6}=\frac{1}{2}\).
  3. \(-\frac{2}{7}+\frac{3}{4}=-\frac{8}{28}+\frac{21}{28}=\frac{13}{28}\).
  4. \(\frac{5}{8}-\frac{7}{12}=\frac{15}{24}-\frac{14}{24}=\frac{1}{24}\).
  5. \(-\frac{4}{9}-\frac{1}{6}=-\frac{8}{18}-\frac{3}{18}=-\frac{11}{18}\).
  6. \(\frac{11}{15}+\left(-\frac{2}{5}\right)=\frac{11}{15}-\frac{6}{15}=\frac{1}{3}\).
  7. \(3\frac{1}{4}-2\frac{2}{3}=\frac{13}{4}-\frac{8}{3}=\frac{39}{12}-\frac{32}{12}=\frac{7}{12}\).
  8. \(-\frac{3}{10}+\frac{5}{12}=-\frac{18}{60}+\frac{25}{60}=\frac{7}{60}\).
  9. \(\frac{7}{9}-\frac{5}{6}=\frac{14}{18}-\frac{15}{18}=-\frac{1}{18}\).
  10. \(-\frac{5}{8}-\frac{1}{4}=-\frac{5}{8}-\frac{2}{8}=-\frac{7}{8}\).

Ответ: 1) \(\frac{1}{10}\); 2) \(\frac{1}{2}\); 3) \(\frac{13}{28}\); 4) \(\frac{1}{24}\); 5) \(-\frac{11}{18}\); 6) \(\frac{1}{3}\); 7) \(\frac{7}{12}\); 8) \(\frac{7}{60}\); 9) \(-\frac{1}{18}\); 10) \(-\frac{7}{8}\).