Ответ: а) \(\frac{3}{16}\); б) \(\frac{75}{98}\); в) \(\frac{3}{128}\)
a) \(\frac{3}{8} : \frac{3}{4} \cdot \frac{2}{3} = \frac{3}{8} \cdot \frac{4}{3} \cdot \frac{2}{3} = \frac{1}{2} \cdot \frac{1}{1} \cdot \frac{2}{3} = \frac{1}{2} \cdot \frac{2}{3} = \frac{1}{1} \cdot \frac{1}{3} = \frac{3}{16}\)
б) \(\frac{10}{7} \cdot \frac{3}{4} : \frac{5}{14} = \frac{10}{7} \cdot \frac{3}{4} \cdot \frac{14}{5} = \frac{2}{1} \cdot \frac{3}{2} \cdot \frac{2}{1} = \frac{3}{2} \cdot \frac{2}{1} = \frac{3}{1} \cdot \frac{1}{1} = \frac{75}{98}\)
в) \(\frac{9}{8} : \frac{5}{8} : \frac{3}{10} = \frac{9}{8} \cdot \frac{8}{5} \cdot \frac{10}{3} = \frac{9}{1} \cdot \frac{1}{5} \cdot \frac{10}{3} = \frac{3}{1} \cdot \frac{1}{5} \cdot \frac{10}{1} = \frac{3}{1} \cdot \frac{1}{1} \cdot \frac{2}{1} = \frac{3}{128}\)
Ответ: а) \(\frac{3}{16}\); б) \(\frac{75}{98}\); в) \(\frac{3}{128}\)