Ответ:

  1. \(23\,908:3=7\,969\) (ост. 1).
  2. \(32\,910\cdot51=32\,910\cdot(50+1)=1\,645\,500+32\,910=1\,678\,410\).
  3. \(28\,935:9=3\,215\).
  4. \(28\,935:9=3\,215\).
  5. \(16\,306:31=526\).