Помогите пожалуйста вычислить А) 9/14-3/7+5/28 Б)7/12-5/6+13/24 В)13/18-29/45+8/15...

Решите задачу:

$\frac{9}{14} - \frac{3}{7} + \frac{5}{28} = \frac{9-6}{14} + \frac{5}{28} = \frac{6+5}{28} = \frac{11}{28}$
$\frac{7}{12} - \frac{5}{6} + \frac{13}{24} = \frac{7-10}{12} + \frac{13}{24} = \frac{-6+13}{24} = \frac{7}{27}$
$\frac{13}{18} - \frac{29}{45} + \frac{8}{15} = \frac{13}{18} - \frac{5}{45} = \frac{13}{18} - \frac{1}{9} = \frac{13-2}{18} = \frac{11}{18}$
$\frac{9}{16}+ \frac{7}{24} - \frac{3}{8} = \frac{9}{16} + \frac{7-9}{24} = \frac{9}{16} - \frac{2}{24} = \frac{9}{16} - \frac{1}{12} = \frac{108-16}{192} = \frac{92}{192} = \frac{23}{48}$