1. Вычислите действия: 4 10/16 − 1 15/20 + 2 2/5.

Сократим дроби: \(\frac{10}{16}=\frac{5}{8}\), \(\frac{15}{20}=\frac{3}{4}\).

\(4\frac{5}{8}-1\frac{3}{4}+2\frac{2}{5}=4\frac{25}{40}-1\frac{30}{40}+2\frac{16}{40}\).

\(4\frac{25}{40}-1\frac{30}{40}=3\frac{65}{40}-1\frac{30}{40}=2\frac{35}{40}=2\frac{7}{8}\).

\(2\frac{7}{8}+2\frac{2}{5}=4+\frac{35}{40}+\frac{16}{40}=5\frac{11}{40}\).

Ответ: \(5\frac{11}{40}\).