§ Задание 1
\[\boxed{\mathbf{2}\mathbf{.}\mathbf{1}}\]

\[\textbf{а)}\ 9999 + 1 = 10\ 000\]
\[\textbf{б)}\ 99\ 099 + 1 = 99\ 100\]
\[\textbf{в)}\ 9\ 999\ 999 + 1 = 10\ 000\ 000\]
\[\boxed{\mathbf{2}\mathbf{.}\mathbf{1}}\]

\[\textbf{а)}\ 9999 + 1 = 10\ 000\]
\[\textbf{б)}\ 99\ 099 + 1 = 99\ 100\]
\[\textbf{в)}\ 9\ 999\ 999 + 1 = 10\ 000\ 000\]