Tính: - 3/13 - 7/17 + (- 5/19) + (- 10/13) + 24/17 - 4/19 ..

$$\begin{gathered} \frac{-3}{13}-\frac{7}{17}+\frac{-5}{19}+\frac{-10}{13}+\frac{24}{17}-\frac{4}{19} \\ \frac{8}{11}.\frac{14}{23}+\frac{8}{11}.\frac{9}{23}.\frac{8}{11} \\ 1,2.\frac{25}{12}-\frac{5}{6}.\frac{6}{-5} \\ \frac{4}{11}+\frac{-5}{13}+\frac{7}{11}+\frac{-8}{13} \end{gathered}$$