Ответ:

  1. а) \(\frac{9}{14}+\frac{3}{14}=\frac{12}{14}=\frac{6}{7}\).
  2. б) \(\frac{21}{50}+\frac{29}{50}=\frac{50}{50}=1\).
  3. в) \(2+\frac{4}{17}=2\frac{4}{17}\).
  4. г) \(17+\frac{9}{13}=17\frac{9}{13}\).
  5. д) \(6\frac{2}{3}-1\frac{1}{3}=5\frac{1}{3}\).
  6. е) \(18\frac{5}{11}-7\frac{1}{11}=11\frac{4}{11}\).
  7. ж) \(4-\frac{3}{5}=3\frac{2}{5}\).
  8. з) \(15-\frac{6}{7}=14\frac{1}{7}\).
  9. и) \(3\frac{1}{5}-1\frac{3}{5}=\frac{16}{5}-\frac{8}{5}=\frac{8}{5}=1\frac{3}{5}\).
  10. к) \(2\frac{4}{9}-1\frac{7}{9}=\frac{22}{9}-\frac{16}{9}=\frac{2}{3}\).
  11. л) \(1\frac{5}{7}+\frac{6}{7}=2\frac{4}{7}\).
  12. м) \(5\frac{8}{13}+4\frac{7}{13}=9\frac{15}{13}=10\frac{2}{13}\).