Ответ:

  1. \(56\,926\,049+2\,789\,487\,958=2\,846\,414\,007\). Проверка: \(2\,846\,414\,007-2\,789\,487\,958=56\,926\,049\).
  2. \(30\,720\,034\,851-6\,087\,336\,257=24\,632\,698\,594\). Проверка: \(24\,632\,698\,594+6\,087\,336\,257=30\,720\,034\,851\).
  3. \(814\,638\,572\,467+46\,274\,579\,455=860\,913\,151\,922\). Проверка: \(860\,913\,151\,922-46\,274\,579\,455=814\,638\,572\,467\).
  4. \(497\,730\,460\,002-98\,790\,873\,256=398\,939\,586\,746\). Проверка: \(398\,939\,586\,746+98\,790\,873\,256=497\,730\,460\,002\).