Ответ:

  1. \(84\,373\,227+39\,992\,334=124\,365\,561\);
  2. \(848\,327+384\,458=1\,232\,785\);
  3. \(392\,495-324\,670=67\,825\);
  4. \(388\,689\,761-293\,794\,499=94\,895\,262\).