Ответ:

  1. \((2786 + 886) : 8 = 3672 : 8 = \mathbf{459}\).
  2. \((3967 + 965) : 9 = 4932 : 9 = \mathbf{548}\).
  3. \((2012 - 968) : 12 = 1044 : 12 = \mathbf{87}\).
  4. \((2213 - 897) : 14 = 1316 : 14 = \mathbf{94}\).
  5. \(38 \cdot 43 - 134 = 1634 - 134 = \mathbf{1500}\).
  6. \(47 \cdot 26 - 122 = 1222 - 122 = \mathbf{1100}\).