Ответ:\(30\,999+1=31\,000\).\(10\,000-1=9\,999\).\(25\,909+1=25\,910\).\(100\,000-1=99\,999\).\(90\,100-1=90\,099\).\(40\,000-1=39\,999\).\(70\,099+1=70\,100\).\(699\,999+1=700\,000\).