Ответ:

  1. 2/8 + 5/8 = 7/8.
  2. 7/12 − 3/8 = 14/24 − 9/24 = 5/24.
  3. 11/16 − 5/8 = 11/16 − 10/16 = 1/16.
  4. 6/35 + 8/10 = 6/35 + 28/35 = 34/35.
  5. 8/15 − 4/9 = 24/45 − 20/45 = 4/45.
  6. 4/15 + 7/12 = 16/60 + 35/60 = 51/60 = 17/20.
  7. 11/48 − 5/8 = 11/48 − 30/48 = −19/48.
  8. 4/5 − 2/3 + 4/15 = 12/15 − 10/15 + 4/15 = 6/15 = 2/5.
  9. 7/8 + 11/12 − 5/6 = 21/24 + 22/24 − 20/24 = 23/24.