а) \(\frac{3}{8}:\frac{2}{3} = \frac{3}{8} \cdot \frac{3}{2} = \frac{9}{16}\)
б) \(\frac{4}{7}:\frac{4}{9} = \frac{4}{7} \cdot \frac{9}{4} = \frac{9}{7} = 1 \frac{2}{7}\)
в) \(11 \frac{2}{5}:3 \frac{4}{5} = \frac{57}{5}:\frac{19}{5} = \frac{57}{5} \cdot \frac{5}{19} = \frac{57}{19} = 3\)
г) \(\frac{16}{17}:8 = \frac{16}{17} \cdot \frac{1}{8} = \frac{2}{17}\)
д) \(12:\frac{6}{7} = 12 \cdot \frac{7}{6} = 2 \cdot 7 = 14\)
Ответ: а) \(\frac{9}{16}\); б) 1 \(\frac{2}{7}\); в) 3; г) \(\frac{2}{17}\); д) 14