Ответ:

  1. 4 + 2 1/4 = 6 1/4.
  2. 5 7/8 + 4 = 9 7/8.
  3. 1 + 5 3/7 = 6 3/7.
  4. 4 + 4 9/26 = 8 9/26.
  5. 6 2/5 + 1 = 7 2/5.
  6. 7 3/8 + 3 = 10 3/8.
  7. 11 + 2 3/5 = 13 3/5.
  8. 5 5/6 + 37 = 42 5/6.
  9. 14 + 9 1/4 = 23 1/4.
  10. 2 2/9 + 21 = 23 2/9.
  11. 14 2/5 + 1 = 15 2/5.
  12. 12 + 7 5/6 = 19 5/6.
  13. 2 + 28 3/8 = 30 3/8.
  14. 15 1/9 + 5 = 20 1/9.
  15. 1 + 1 1/4 = 2 1/4.
  16. 8 3/10 + 7 = 15 3/10.
  17. 5 + 13 5/8 = 18 5/8.
  18. 3 2/11 + 9 = 12 2/11.
  19. 6 + 1 1/6 = 7 1/6.
  20. 17 3/7 + 7 = 24 3/7.