please tolong jawab dong

[tex]9)2 \ \frac{1}{4} + \frac{5}{6} \\ = \frac{9}{4} + \frac{5}{6} \\ = \frac{27}{12} + \frac{10}{12} \\ = \frac{37}{12} \\ = 3 \ \frac{1}{12} \\ 10) \frac{1}{8} + 3 \ \frac{4}{7} \\ = \frac{1}{8} + \frac{25}{7} \\ = \frac{7}{56} + \frac{200}{56} \\ = \frac{207}{56} \\ = 3 \ \frac{39}{56} \\ 11)1 \frac{3}{4} + 2 \ \frac{5}{8} \\ = \frac{7}{4} + \frac{21}{8} \\ = \frac{14}{8} + \frac{21}{8} \\ = \frac{35}{8} \\ = 4 \ \frac{3}{8} \\ 12)15 \ \frac{3}{5} + 2 \ \frac{3}{4} \\ = \frac{78}{5} + \frac{11}{4} \\ = \frac{312}{20} + \frac{55}{20} \\ = \frac{367}{20} \\ = 18 \ \frac{7}{20} [/tex]