Ответ:

  1. \(67+84=151\);
  2. \(371+253=624\);
  3. \(121+469=590\);
  4. \(633+129=762\);
  5. \(422-105=317\);
  6. \(804-62=742\);
  7. \(357+272=629\);
  8. \(631-27=604\).