Ответ:

  1. \((8 - 7) + 25 = 1 + 25 = 26\).
  2. \(40 - (2 + 7) = 40 - 9 = 31\).
  3. \(70 - (12 + 26) = 70 - 38 = 32\).
  4. \(13 + (37 - 24) = 13 + 13 = 26\).