Вычислите: 5 : 4/5; 7 : 2/9; 12 : 1/3; 23 : 2/23; 9 : 10/11.

1. \(5:\frac{4}{5}=5\cdot\frac{5}{4}=\frac{25}{4}\).
2. \(7:\frac{2}{9}=7\cdot\frac{9}{2}=\frac{63}{2}\).
3. \(12:\frac{1}{3}=12\cdot 3=36\).
4. \(23:\frac{2}{23}=23\cdot\frac{23}{2}=\frac{529}{2}\).
5. \(9:\frac{10}{11}=9\cdot\frac{11}{10}=\frac{99}{10}\).

Ответ: \(\frac{25}{4};\ \frac{63}{2};\ 36;\ \frac{529}{2};\ \frac{99}{10}\).