Ответ:

  1. \(8 : \dfrac{4}{5}=8\cdot\dfrac{5}{4}=10\).
  2. \(1 : \dfrac{7}{16}=1\cdot\dfrac{16}{7}=\dfrac{16}{7}\).
  3. \(\dfrac{8}{15}:24=\dfrac{8}{15}\cdot\dfrac{1}{24}=\dfrac{1}{45}\).

Ответ: 1) \(10\); 2) \(\dfrac{16}{7}\); 3) \(\dfrac{1}{45}\).