1. Выполните деление: 1) 3/4 : 5/7; 2) 5/18 : 25/27; 3) 9/16 : 3/64; 4) 25/72 : 4/63.

1. \(\dfrac{3}{4} : \dfrac{5}{7}=\dfrac{3}{4}\cdot\dfrac{7}{5}=\dfrac{21}{20}\).
2. \(\dfrac{5}{18} : \dfrac{25}{27}=\dfrac{5}{18}\cdot\dfrac{27}{25}=\dfrac{3}{10}\).
3. \(\dfrac{9}{16} : \dfrac{3}{64}=\dfrac{9}{16}\cdot\dfrac{64}{3}=12\).
4. \(\dfrac{25}{72} : \dfrac{4}{63}=\dfrac{25}{72}\cdot\dfrac{63}{4}=\dfrac{175}{32}\).

Ответ: 1) \(\dfrac{21}{20}\); 2) \(\dfrac{3}{10}\); 3) \(12\); 4) \(\dfrac{175}{32}\).