Ответ:

  1. 58000 : 1000 = 58.
  2. 4560 × 100 = 456000.
  3. 839100 : 100 = 8391.
  4. 561000 : 1000 = 561.
  5. 678000 : 10 = 67800.
  6. 4561 × 100 = 456100.
  7. 452000 : 1000 = 452.
  8. 872100 : 100 = 8721.
  9. 23 × 1000 = 23000.