Ответ:

  1. а) \(\frac{2}{9}:\frac{9}{14}=\frac{2}{9}\cdot\frac{14}{9}=\frac{4}{81}\).
  2. б) \(\frac{7}{17}:\frac{28}{51}=\frac{7}{17}\cdot\frac{51}{28}=\frac{3}{4}\).
  3. в) \(\frac{8}{91}:\frac{6}{13}=\frac{8}{91}\cdot\frac{13}{6}=\frac{4}{21}\).
  4. г) \(42:\frac{6}{7}=42\cdot\frac{7}{6}=49\).
  5. д) \(3\frac{5}{9}:\frac{16}{27}=\frac{32}{9}\cdot\frac{27}{16}=6\).
  6. е) \(2\frac{7}{10}:3\frac{2}{5}=\frac{27}{10}:\frac{17}{5}=\frac{27}{34}\).

Ответ: а) \(\frac{4}{81}\); б) \(\frac{3}{4}\); в) \(\frac{4}{21}\); г) 49; д) 6; е) \(\frac{27}{34}\).