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