2.263 Найдите произведение: a) $$rac{5}{6} \cdot 3$$; б) $$rac{16}{21} \cdot 14$$; в) $$20 \cdot \frac{9}{16}$$; г) $$rac{4}{9} \cdot 27$$; д) $$rac{1}{2} \cdot 50$$; e) $$13 \cdot \frac{8}{13}$$; ж) $$1 \cdot \frac{4}{5}$$; з) $$\frac{11}{15} \cdot 0$$

a) $$\frac{5}{6} \cdot 3 = \frac{5 \cdot 3}{6} = \frac{15}{6} = \frac{5}{2} = 2\frac{1}{2}$$

б) $$\frac{16}{21} \cdot 14 = \frac{16 \cdot 14}{21} = \frac{16 \cdot 2}{3} = \frac{32}{3} = 10\frac{2}{3}$$

в) $$20 \cdot \frac{9}{16} = \frac{20 \cdot 9}{16} = \frac{5 \cdot 9}{4} = \frac{45}{4} = 11\frac{1}{4}$$

г) $$\frac{4}{9} \cdot 27 = \frac{4 \cdot 27}{9} = 4 \cdot 3 = 12$$

д) $$\frac{1}{2} \cdot 50 = \frac{50}{2} = 25$$

e) $$13 \cdot \frac{8}{13} = \frac{13 \cdot 8}{13} = 8$$

ж) $$1 \cdot \frac{4}{5} = \frac{4}{5}$$

з) $$\frac{11}{15} \cdot 0 = 0$$