Ответ:

  1. 9 999 + 1 = 10 000

  2. 36 999 + 1 = 37 000

  3. 62 889 + 1 = 62 890

  4. 23 000 − 1 = 22 999

  5. 3 599 + 1 = 3 600

  6. 1 579 + 1 = 1 580

  7. 4 200 − 1 = 4 199

  8. 5 000 − 1 = 4 999