Ответ:
\[\frac{4}{5}-\frac{8}{15}=\frac{12}{15}-\frac{8}{15}=\frac{4}{15}.\]
\[\frac{3}{16}\cdot\frac{4}{15}=\frac{1}{20}.\]
Ответ: \(\frac{1}{20}\).
\[\frac{4}{5}-\frac{8}{15}=\frac{12}{15}-\frac{8}{15}=\frac{4}{15}.\]
\[\frac{3}{16}\cdot\frac{4}{15}=\frac{1}{20}.\]
Ответ: \(\frac{1}{20}\).