[tex]\frac{13}{8} + \frac{20}{8} + \frac{6}{8} = \frac{39}{8}[/tex]
[tex]\frac{10}{24} + \frac{11}{24} + \frac{4}{24} = \frac{25}{24}[/tex]
[tex]\frac{28}{14} + \frac{6}{14} + \frac{11}{14} = \frac{45}{14}[/tex]
[tex]\frac{18}{30} - \frac{8}{30} - \frac{7}{30} = \frac{3}{30} [/tex]
[tex]\frac{28}{18} + \frac{12}{18} - \frac{5}{18} = \frac{25}{18}[/tex]
[tex] \frac{34}{34} - \frac{9}{34} + \frac{36}{34} = \frac{61}{34} [/tex]