Ответ:\(7\,000\cdot100+6\,000=700\,000+6\,000=706\,000\).\(999\,999+1=1\,000\,000\).\(8\,600\cdot100-60\,000=860\,000-60\,000=800\,000\).\(1\,000\,000:10=100\,000\).\(64\cdot7=448\).\(45\cdot9=405\).