[tex] \frac{1}{3} + \frac{5}{9} = \frac{3}{9} + \frac{5}{9} = \frac{8}{9} [/tex]
[tex] \frac{17}{24} - \frac{-5}{6} = \frac{17}{24} - \frac{-20}{24} = \frac{37}{24} [/tex]
[tex] \frac{11}{6} + \frac{-7}{3} = \frac{11}{6} + \frac{-14}{6} = - \frac{3}{6} = - \frac{1}{2} [/tex]
