4 11- 1.16 21 2) 14=2 7 3)유(一) 24

Решение:

1. Пример 1:

   \[1 \frac{16}{21} + \frac{4}{7} = 1 \frac{16}{21} + \frac{4 \cdot 3}{7 \cdot 3} = 1 \frac{16}{21} + \frac{12}{21} = 1 \frac{16+12}{21} = 1 \frac{28}{21} = 1 + \frac{28}{21} = 1 + \frac{4}{3} = 1 + 1 \frac{1}{3} = 2 \frac{1}{3}\]

2. Пример 2:

   \[\frac{14}{5} = 2 \frac{4}{5}\]

3. Пример 3:

   \[3 \frac{5}{24} - (-\frac{1}{3}) = 3 \frac{5}{24} + \frac{1}{3} = 3 \frac{5}{24} + \frac{1 \cdot 8}{3 \cdot 8} = 3 \frac{5}{24} + \frac{8}{24} = 3 \frac{5+8}{24} = 3 \frac{13}{24}\]

Ответ: 1) 2 \frac{1}{3}; 2) 2 \frac{4}{5}; 3) 3 \frac{13}{24}