Ответ:

  1. 0,6 = 3/5; 3/5 · 5/8 = 3/8.
  2. 1,2 = 6/5; 6/5 · 5/6 = 1.
  3. 0,75 = 3/4 и 1 1/3 = 4/3; 3/4 · 4/3 = 1.