Ответ:

  1. 4/5 : 1/2 = 4/5 · 2/1 = 8/5.
  2. 3/7 : 6/7 = 3/7 · 7/6 = 1/2.
  3. 1/2 : 3/4 = 1/2 · 4/3 = 2/3.
  4. 8/11 : 16/77 = 8/11 · 77/16 = 7/2.
  5. 5/23 : 15/46 = 5/23 · 46/15 = 2/3.
  6. 14/25 : 21/50 = 14/25 · 50/21 = 4/3.
  7. 7/13 : 5/52 = 7/13 · 52/5 = 28/5.
  8. 12/15 : 20/50 = 12/15 · 50/20 = 2.
  9. 13/24 : 13/48 = 13/24 · 48/13 = 2.