\[\boxed{\mathbf{2.2}\mathbf{37}}\]
\[= 8 + 5 + 34\frac{1}{14} = 13 + 34\frac{1}{14} =\]
\[= 47\frac{1}{14}\]
\[\textbf{б)}\ 7\frac{7}{20} - 4,75 + 3\frac{4}{5} =\]
\[= 7\frac{35}{100} - 4,75 + 3\frac{8}{10} =\]
\[= 7,35 - 4,75 + 3,8 =\]
\[= 11,15 - 4,75 = 6,4\]
\[\textbf{в)}\ 9\frac{7}{15} - \left( 5\frac{1}{9} + 2\frac{2}{15} \right) =\]
\[= \left( 9\frac{7}{15} - 2\frac{2}{15} \right) - 5\frac{1}{9} =\]
\[= 7\frac{5}{15} - 5\frac{1}{9} = 7\frac{1^{\backslash 3}}{3} - 5\frac{1}{9} =\]
\[= 7\frac{3}{9} - 5\frac{1}{9} = 2\frac{2}{9}\]
\[\textbf{г)}\ \left( 22\frac{8}{9} + 2\frac{1}{7} \right) - 9\frac{5}{9} =\]
\[= \left( 22\frac{8}{9} - 9\frac{5}{9} \right) + 2\frac{1}{7} =\]
\[= 13\frac{3}{9} + 2\frac{1}{7} = 13\frac{1^{\backslash 7}}{3} + 2\frac{1^{\backslash 3}}{7} =\]
\[= 13\frac{7}{21} + 2\frac{3}{21} = 15\frac{10}{21}\]