Ответ:
\(\frac{4}{5}+\frac{8}{15}=\frac{12}{15}+\frac{8}{15}=\frac{20}{15}=\frac{4}{3}\).
\(\frac{3}{10}:\frac{4}{3}=\frac{3}{10}\cdot\frac{3}{4}=\frac{9}{40}\).
Ответ: \(\frac{9}{40}\)
\(\frac{4}{5}+\frac{8}{15}=\frac{12}{15}+\frac{8}{15}=\frac{20}{15}=\frac{4}{3}\).
\(\frac{3}{10}:\frac{4}{3}=\frac{3}{10}\cdot\frac{3}{4}=\frac{9}{40}\).
Ответ: \(\frac{9}{40}\)