Ответ:

  1. 5 − 3 2/9 = 4 9/9 − 3 2/9 = 1 7/9.
  2. 1 5/6 + 1/3 = 1 5/6 + 2/6 = 2 1/6.
  3. 4 1/4 − 2 1/8 = 4 2/8 − 2 1/8 = 2 1/8.
  4. 2 2/9 − 1 4/9 = 1 11/9 − 1 4/9 = 7/9.
  5. 3,6 + 2/5 = 3,6 + 0,4 = 4.
  6. 1 11/14 + 2 5/14 = 3 + 16/14 = 4 1/7.
  7. 8 − 5 7/8 = 7 8/8 − 5 7/8 = 2 1/8.
  8. 2 1/9 − 1 1/3 = 2 1/9 − 1 3/9 = 7/9.
  9. 1 4/5 + 0,8 = 1,8 + 0,8 = 2,6.
  10. 3 1/6 − 2 1/12 = 3 2/12 − 2 1/12 = 1 1/12.
  11. 2 7/16 + 1 9/16 = 3 + 16/16 = 4.
  12. 1 1/2 − 1/4 = 1 2/4 − 1/4 = 1 1/4.
  13. 2 2/5 + 1/5 = 2 3/5 = 2 3/5.
  14. 4 1/6 − 2 1/18 = 4 3/18 − 2 1/18 = 2 1/9.
  15. 1 5/8 + 2 7/8 = 3 + 12/8 = 4 1/2.