Ответ:

  1. Делители 30: 1, 2, 3, 5, 6, 10, 15, 30.
  2. Делители 50: 1, 2, 5, 10, 25, 50.
  3. Делители 72: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72.