Вычислите: a) $$5 : \frac{2}{3}$$; б) $$\frac{3}{8} : \frac{1}{3}$$; в) $$\frac{1}{12} : \frac{5}{36}$$; г) $$\frac{14}{55} : \frac{5}{21}$$; д) $$\frac{121}{234} : \frac{11}{12}$$

a) $$5 : \frac{2}{3} = 5 \cdot \frac{3}{2} = \frac{15}{2} = 7\frac{1}{2}$$; б) $$\frac{3}{8} : \frac{1}{3} = \frac{3}{8} \cdot \frac{3}{1} = \frac{9}{8} = 1\frac{1}{8}$$; в) $$\frac{1}{12} : \frac{5}{36} = \frac{1}{12} \cdot \frac{36}{5} = \frac{36}{60} = \frac{3}{5}$$; г) $$\frac{14}{55} : \frac{5}{21} = \frac{14}{55} \cdot \frac{21}{5} = \frac{294}{275} = 1\frac{19}{275}$$; д) $$\frac{121}{234} : \frac{11}{12} = \frac{121}{234} \cdot \frac{12}{11} = \frac{11}{117} \cdot 6 = \frac{66}{117} = \frac{22}{39}$$