\[\boxed{\mathbf{2.2}\mathbf{89}\mathbf{.\ ОК\ ГДЗ - домашка\ на\ }5}\]
\[\textbf{а)}\frac{1^{\backslash 4}}{2} + \frac{1}{8} = \frac{4}{8} + \frac{1}{8} = \frac{5}{8}\]
\[\frac{5}{8} + 1\frac{3^{\backslash 2}}{4} = \frac{5}{8} + 1\frac{6}{8} = 1\frac{11}{8} = 2\frac{3}{8}\]
\[2\frac{3}{8} - 1\frac{5}{8} = 1\frac{11}{8} - 1\frac{5}{8} = \frac{6}{8} = \frac{3}{4}\]
\[\textbf{б)}\ \frac{2^{\backslash 2}}{7} + \frac{3}{14} = \frac{4}{14} + \frac{3}{14} = \frac{7}{14} = \frac{1}{2}\]
\[\frac{2^{\backslash 3}}{7} - \frac{5}{21} = \frac{6}{21} - \frac{5}{21} = \frac{1}{21}\]
\[\frac{2^{\backslash 4}}{7} - \frac{3}{28} = \frac{8}{28} - \frac{3}{28} = \frac{5}{28}\]