Ответ:

  1. \(76 - 70 = 6\).
  2. \(54 - 4 = 50\).
  3. \(90 - 40 = 50\).
  4. \(6 + 7 - 9 = 13 - 9 = 4\).
  5. \(10 + 3 - 4 = 13 - 4 = 9\).
  6. \(18 - 10 + 5 = 8 + 5 = 13\).
  7. \(69 + 1 = 70\).
  8. \(30 + 40 = 70\).
  9. \(50 - 1 = 49\).