Ответ:

  1. \(227 + (1000 - 734) = 227 + 266 = 493\).
  2. \(601 - (296 + 145) = 601 - 441 = 160\).
  3. \(503 - (675 - 486) = 503 - 189 = 314\).
  4. \(812 - (435 + 178) = 812 - 613 = 199\).
  5. \(327 + (905 - 756) = 327 + 149 = 476\).
  6. \(452 + (372 - 195) = 452 + 177 = 629\).
  7. \(431 + (189 + 381) = 431 + 570 = 1001\).
  8. \(185 - (403 - 375) = 185 - 28 = 157\).
  9. \(203 + (197 + 453) = 203 + 650 = 853\).

Ответ: 493; 160; 314; 199; 476; 629; 1001; 157; 853.