Ответ:

  1. \(600 \cdot 9 = 5400\).
  2. \(2409 \cdot 8 = 19272\).
  3. \(1200 \cdot 4 = 4800\).
  4. \(6547 + 2098 - 145 = 8645 - 145 = 8500\).
  5. \(3270 + (7200 - 345) = 3270 + 6855 = 10125\).
  6. \(5400 : 9 = 600\).
  7. \(27357 + (10000 - 230) = 27357 + 9770 = 37127\).
  8. \(550098 - (238100 + 152786) = 550098 - 390886 = 159212\).