§ Вопрос (Стр. 29)
\[\boxed{Вопрос.}\]

\[90\ 100 - 1 = 90\ 099\]
\[40\ 000 - 1 = 39\ 999\]
\[39\ 099 + 1 = 39\ 100\]
\[699\ 999 + 1 = 700\ 000\]
\[Страница\ 30.\ \]
\[\boxed{Вопрос.}\]

\[90\ 100 - 1 = 90\ 099\]
\[40\ 000 - 1 = 39\ 999\]
\[39\ 099 + 1 = 39\ 100\]
\[699\ 999 + 1 = 700\ 000\]
\[Страница\ 30.\ \]