\[\boxed{\mathbf{2}\mathbf{.}\mathbf{107}}\]
\[\textbf{а)}\ 176 - 149 = 27\]
\[\textbf{б)}\ 689 - 499 = 190\]
\[\textbf{в)}\ 67\ 005 - 58\ 906 = 8099\]
\[\textbf{г)}\ 39\ 067 - 8471 = 30\ 596\]
\[\textbf{д)}\ 2\ 222\ 222\ 222 - 987\ 654\ 321 =\]
\[= 1\ 234\ 567\ 901\]
\[\textbf{е)}\ 1\ 234\ 567\ 890 - 45\ 678\ 910 =\]
\[= 1\ 188\ 888\ 980\]