§ Вопрос (стр. 29)
\[\boxed{Страница\ \mathbf{29.}}\]
\[\boxed{Вопрос.}\]

\[90\ 100 - 1 = 90\ 099\]
\[40\ 000 - 1 = 39\ 999\]
\[39\ 099 + 1 = 39\ 100\]
\[699\ 999 + 1 = 700\ 000\]
\[\boxed{Страница\ \mathbf{29.}}\]
\[\boxed{Вопрос.}\]

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