Ответ:

  1. \(\frac{4}{7}\)
  2. \(\frac{2}{9}\)
  3. \(\frac{1}{2}\)
  4. \(\frac{1}{5}\)
  5. \(\frac{1}{7}\)
  6. \(\frac{1}{3}\)
  7. \(\frac{2}{5}\)
  8. \(\frac{1}{2}\)
  9. \(\frac{1}{11}\)
  10. \(\frac{1}{3}\)
  11. \(\frac{1}{4}\)
  12. \(\frac{1}{2}\)
  13. \(\frac{1}{3}\)
  14. \(\frac{1}{3}\)
  15. \(\frac{1}{5}\)
  16. \(\frac{1}{20}\)
  17. \(\frac{1}{4}\)
  18. \(\frac{1}{3}\)
  19. \(\frac{1}{3}\)
  20. \(\frac{1}{8}\)