1. Найдите значение выражения: a) $$4\frac{4}{9} : 2\frac{2}{3}$$; б) $$\frac{2\frac{1}{4}}{1\frac{1}{8}}$$; в) $$\frac{2,8}{16,8}$$; г) $$\frac{1,21}{3\frac{2}{3}}$$

a) $$4\frac{4}{9} : 2\frac{2}{3} = \frac{40}{9} : \frac{8}{3} = \frac{40}{9} \cdot \frac{3}{8} = \frac{5}{3} = 1\frac{2}{3}$$

б) $$\frac{2\frac{1}{4}}{1\frac{1}{8}} = \frac{\frac{9}{4}}{\frac{9}{8}} = \frac{9}{4} \cdot \frac{8}{9} = 2$$

в) $$\frac{2,8}{16,8} = \frac{28}{168} = \frac{1}{6}$$

г) $$\frac{1,21}{3\frac{2}{3}} = \frac{1,21}{\frac{11}{3}} = 1,21 \cdot \frac{3}{11} = \frac{121}{100} \cdot \frac{3}{11} = \frac{11}{100} \cdot 3 = \frac{33}{100} = 0,33$$