Ответ:

  1. а) 2 1/3 + 1 2/3 = 3 + 3/3 = 4.
  2. б) 1 4/5 + 3 3/5 = 4 + 7/5 = 5 2/5.
  3. в) 2 1/6 + 1 5/12 = 3 + 2/12 + 5/12 = 3 7/12.
  4. г) 3 1/7 + 1 5/14 = 4 + 2/14 + 5/14 = 4 1/2.