Ответ:
\(\frac{2}{5}+\frac{4}{10}=\frac{2}{5}+\frac{2}{5}=\frac{4}{5}\).
\(\frac{4}{5}\cdot\frac{3}{16}=\frac{3}{20}\).
Ответ: \(\frac{3}{20}\).
\(\frac{2}{5}+\frac{4}{10}=\frac{2}{5}+\frac{2}{5}=\frac{4}{5}\).
\(\frac{4}{5}\cdot\frac{3}{16}=\frac{3}{20}\).
Ответ: \(\frac{3}{20}\).