Ответ:

  1. \(9999+1=10000\)
  2. \(56999+1=57000\)
  3. \(62889+1=62890\)
  4. \(23000-1=22999\)
  5. \(35999+1=36000\)
  6. \(1579+1=1580\)
  7. \(4200-1=4199\)
  8. \(5000-1=4999\)

Ответ: 10000; 57000; 62890; 22999; 36000; 1580; 4199; 4999.