Сделайте пожалуйста 39

Решите задачу:

$\frac{7}{15} + \frac{2}{15} = \frac{7+2}{15} = \frac{9}{15} = \frac{3}{5} = 0,6$
$\frac{37}{46} - \frac{21}{46} = \frac{37-21}{46} = \frac{16}{46} = \frac{8}{23} = 0,35$
$5\frac{17}{36} + 3\frac{7}{36} = \frac{5*36+17}{36} + \frac{3*36+7}{36} = \frac{197}{36} + \frac{115}{36} = \frac{197+115}{36} = \frac{312}{36} = \frac{26}{3} = 8,6$
$17\frac{53}{63} - 9\frac{32}{63} = \frac{17*63+53}{63} - \frac{9*63+32}{63} = \frac{1124}{63} - \frac{599}{63} = \frac{1124-599}{63} = \frac{525}{63} = \frac{75}{9} = \frac{25}{3} = 8,3$