A= 7/5 -7/3x15/14=[tex] \frac{7}{5} - \frac{7}{3} * \frac{15}{14} = \frac{7}{5} - \frac{5}{2} = \frac{14-25}{10} = \frac{-11}{10} [/tex]
B=8/5-3/4 / 9/8=[tex] \frac{ \frac{8}{5} - \frac{3}{4} }{ \frac{9}{8} } = \frac{32-15}{20}* \frac{8}{9} = \frac{17}{5}* \frac{2}{9} = \frac{34}{45} [/tex]
C=8/3-2/5 / 7/5=[tex] \frac{ \frac{8}{3}- \frac{2}{5} }{ \frac{7}{5} } = \frac{ \frac{40-6}{15} }{ \frac{7}{5} } = \frac{34}{15} * \frac{5}{7} = \frac{34}{21} [/tex]
