\[\boxed{\mathbf{2.}\mathbf{43}}\]
\[\textbf{а)}\ \frac{4}{13} + \frac{3}{13} = \frac{4 + 3}{13} = \frac{7}{13}\]
\[\textbf{б)}\ \frac{7}{11} - \frac{1}{11} = \frac{7 - 1}{11} = \frac{6}{11}\]
\[\textbf{в)}\ 4\frac{3}{9} + 2\frac{1}{9} = 6\frac{3 + 1}{9} = 6\frac{4}{9}\]
\[\textbf{г)}\ 8\frac{4}{5} - 7\frac{2}{5} = 1\frac{4 - 2}{5} = 1\frac{2}{5}\]
\[\textbf{д)}\ 3\frac{9}{16} + 2\frac{3}{16} = 5\frac{9 + 3}{16} =\]
\[= 5\frac{12}{16} = 5\frac{3}{4}\]
\[\textbf{е)}\ 5\frac{6}{13} - 3\frac{1}{13} = 2\frac{6 - 1}{13} = 2\frac{5}{13}\]