Ответ:

1) \(27 + (9 \cdot 6 - 25) + 72 : 8\)

  1. \(9 \cdot 6 = 54\)
  2. \(54 - 25 = 29\)
  3. \(72 : 8 = 9\)
  4. \(27 + 29 = 56\)
  5. \(56 + 9 = 65\)

2) \(100 - (63 + 27 - 58) : 4\)

  1. \(63 + 27 = 90\)
  2. \(90 - 58 = 32\)
  3. \(32 : 4 = 8\)
  4. \(100 - 8 = 92\)

3) \((31 - 30) \cdot (63 \cdot 7 + 64 : 8)\)

  1. \(31 - 30 = 1\)
  2. \(63 \cdot 7 = 441\)
  3. \(64 : 8 = 8\)
  4. \(441 + 8 = 449\)
  5. \(1 \cdot 449 = 449\)

Ответ: 65; 92; 449.