\(\boxed{\mathbf{2.}\mathbf{342}\mathbf{.\ ОК\ ГДЗ - домашка\ на\ }5}\)
\[\textbf{а)}\ 3\frac{1^{\backslash 2}}{11} + 2\frac{3}{22} = 3\frac{2}{22} + 2\frac{3}{22} =\]
\[= 5\frac{5}{22}\]
\[\textbf{б)}\ 3\frac{1}{3} - 1\frac{1}{5} = 3\frac{5}{15} - 1\frac{3}{15} = 2\frac{2}{15}\]
\[\textbf{в)}\ 4 - 2\frac{4}{7} = 3\frac{7}{7} - 2\frac{4}{7} = 1\frac{3}{7}\]
\[\textbf{г)}\ 2\frac{3}{4} - 1\frac{5}{6} = 1\frac{7}{4} - 1\frac{5}{6} =\]
\[= \frac{28}{24} - \frac{20}{24} = \frac{8}{24} = \frac{1}{3}\ \]