31. \(\frac{12}{5} : \frac{5}{16}\)

Решение:

\(\frac{12}{5} \div \frac{5}{16} = \frac{12}{5} \times \frac{16}{5} = \frac{12 \times 16}{5 \times 5} = \frac{192}{25}\)

Ответ: \(\frac{192}{25}\)