Ну кто нибудь уже.........

Решите задачу:

$42. a) \frac{5}{9} + \frac{2}{3} = \frac{5}{9} + \frac{6}{9} = \frac{11}{9} = 1 \frac{2}{9} \\ b) \frac{1}{12} + \frac{3}{4} = \frac{1}{12} + \frac{9}{12} = \frac{10}{12} = \frac{5}{6} \\ 43. a) \frac{5}{12} + \frac{1}{3} = \frac{5}{12} + \frac{4}{12} = \frac{9}{12} = \frac{3}{4} \\ b) \frac{11}{24} + \frac{3}{8} = \frac{11}{24} + \frac{9}{24} = \frac{20}{24} = \frac{5}{6} \\$
$44. a) \frac{11}{16} - \frac{3}{8} = \frac{11}{16} - \frac{6}{16} = \frac{5}{16} \\ b) \frac{5}{6} - \frac{5}{12} = \frac{10}{12} - \frac{5}{12} = \frac{5}{12} \\$