a) \(\frac{3}{8}:\frac{3}{4} \cdot \frac{2}{3} = \frac{3}{8} \cdot \frac{4}{3} \cdot \frac{2}{3} = \frac{3 \cdot 4 \cdot 2}{8 \cdot 3 \cdot 3} = \frac{24}{72} = \frac{1}{3}\)
б) \(\frac{10}{7} \cdot \frac{3}{4}:\frac{5}{14} = \frac{10}{7} \cdot \frac{3}{4} \cdot \frac{14}{5} = \frac{10 \cdot 3 \cdot 14}{7 \cdot 4 \cdot 5} = \frac{420}{140} = 3\)
в) \(\frac{9}{8}:\frac{5}{8} = \frac{9}{8} \cdot \frac{8}{5} = \frac{9 \cdot 8}{8 \cdot 5} = \frac{9}{5} = 1\frac{4}{5}\)
Ответ: а) \(\frac{1}{3}\); б) 3; в) \(1\frac{4}{5}\)