Ответ:
\(\frac{\frac{7}{10}+\frac{1}{4}+\frac{2}{5}}{3}=\frac{\frac{14}{20}+\frac{5}{20}+\frac{8}{20}}{3}=\frac{27}{20}\cdot\frac{1}{3}=\frac{9}{20}\).
Ответ: \(\frac{9}{20}\)
\(\frac{\frac{7}{10}+\frac{1}{4}+\frac{2}{5}}{3}=\frac{\frac{14}{20}+\frac{5}{20}+\frac{8}{20}}{3}=\frac{27}{20}\cdot\frac{1}{3}=\frac{9}{20}\).
Ответ: \(\frac{9}{20}\)