Ответ:

  1. \(84=80+4\).
  2. \(207=200+7\).
  3. \(38\,407=30\,000+8\,000+400+7\).
  4. \(882\,735=800\,000+80\,000+2\,000+700+30+5\).
  5. \(5\,021\,020=5\,000\,000+20\,000+1\,000+20\).
  6. \(607\,975=600\,000+7\,000+900+70+5\).