259 Найдите произведение: a) 5/6 · 3; б) 16/21 · 14; в) 1/2 · 50; г) 13 · 8/13; д) 1 · 4/5; e) 11/15 · 0.

1. $$\frac{5}{6} \cdot 3 = \frac{5 \cdot 3}{6} = \frac{15}{6} = \frac{5}{2} = 2\frac{1}{2}$$
2. $$\frac{16}{21} \cdot 14 = \frac{16 \cdot 14}{21} = \frac{16 \cdot 2}{3} = \frac{32}{3} = 10\frac{2}{3}$$
3. $$\frac{1}{2} \cdot 50 = \frac{1 \cdot 50}{2} = \frac{50}{2} = 25$$
4. $$13 \cdot \frac{8}{13} = \frac{13 \cdot 8}{13} = 8$$
5. $$1 \cdot \frac{4}{5} = \frac{4}{5}$$
6. $$\frac{11}{15} \cdot 0 = 0$$

Ответ:

1. $$2\frac{1}{2}$$
2. $$10\frac{2}{3}$$
3. $$25$$
4. $$8$$
5. $$\frac{4}{5}$$
6. $$0$$