Ответ:

  1. \(75 : 15 = 5\).
  2. \(75 : 3 = 25\).
  3. \(860 - 270 : 9 \times 4 = 860 - 30 \times 4 = 860 - 120 = 740\).
  4. \(18 \times 6 = 108\).
  5. \(2 \times 19 = 38\).
  6. \(840 - (36 + 24) : 3 \times 2 = 840 - 60 : 3 \times 2 = 840 - 20 \times 2 = 800\).

Ответ: 5; 25; 740; 108; 38; 800.