Ответ:
\(\left(\frac{16}{42}+\frac{15}{42}\right):\frac{5}{21}=\frac{31}{42}\cdot\frac{21}{5}=\frac{31}{10}\).
Ответ: \(\frac{31}{10}\).
\(\left(\frac{16}{42}+\frac{15}{42}\right):\frac{5}{21}=\frac{31}{42}\cdot\frac{21}{5}=\frac{31}{10}\).
Ответ: \(\frac{31}{10}\).