Найдите значение выражения

А) $\frac{9}{56} -( \frac{28}{60} - \frac{25}{60} )*( \frac{3}{14} + \frac{7}{14} )= \frac{9}{56}-( \frac{1}{20} )*( \frac{10}{14} )=\frac{9}{56}-\frac{2}{56}= \frac{1}{8}$
б) $( \frac{52}{36}+\frac{102}{36}- \frac{99}{36})*(\frac{35}{14}-\frac{11}{14})=(\frac{55}{36})*(\frac{24}{14})=\frac{1320}{504}=2\frac{13}{21}$
в) $\frac{55}{20} /( \frac{30}{20} - \frac{8}{20})+(\frac{9}{12}+\frac{10}{12})/\frac{38}{12}=\frac{55*20}{20*22}+\frac{19*12}{12*38}=\frac{5}{2}+\frac{1}{2}=3$