Tính

----- Nội dung dịch tự động từ ảnh -----
**Tính:**

\( \frac{3}{7} + \frac{4}{5} \)

\( \frac{4}{9} + \frac{3}{8} \)

\( \frac{8}{9} - \frac{6}{11} \)

\( \frac{19}{6} + \frac{21}{13} \)

\( \frac{25}{12} - \frac{3}{13} \)

\( \frac{12}{7} - \frac{5}{16} \)

\( \frac{9}{5} \times \frac{7}{6} \)

\( \frac{3}{4} : \frac{2}{7} \)

\( \frac{7}{13} : 4 \)

\( \frac{12}{7} \times \frac{3}{8} \)

\( \frac{4}{9} : \frac{3}{5} \)

\( \frac{18}{5} : 3 \)

\( \frac{17}{5} - 3 \)

\( 9 - \frac{4}{5} \)

\( \frac{5}{8} + 4 \)

\( 8 + \frac{3}{4} \)

\( \frac{12}{13} + 3 \)

\( \frac{31}{5} - 5 \)