Ответ:
\(3\cdot1000=3000\); \(78\,000\cdot100=7\,800\,000\); \(45\,000:1000=45\); \(380\,000:100=3800\).
\(12\,000\cdot3=36\,000\); \(4500\cdot200=900\,000\); \(64\,000:80=800\); \(9\,200\,000:400=23\,000\).
\(3\cdot1000=3000\); \(78\,000\cdot100=7\,800\,000\); \(45\,000:1000=45\); \(380\,000:100=3800\).
\(12\,000\cdot3=36\,000\); \(4500\cdot200=900\,000\); \(64\,000:80=800\); \(9\,200\,000:400=23\,000\).