1. Найди значение выражения: a) \(\frac{2,8}{16,8}\); б) \(4\frac{2\frac{1}{3}}{1\frac{1}{8}}\) ; в) \(3\frac{1,21}{3} \cdot \frac{2}{3}\)

a) \(\frac{2,8}{16,8}\) = \(\frac{28}{168}\) = \(\frac{1}{6}\)

б) \(4\frac{2\frac{1}{3}}{1\frac{1}{8}}\) = \(\frac{4 \frac{7}{3}}{\frac{9}{8}}\) = \(\frac{ \frac{14}{3}}{\frac{9}{8}}\) = \(\frac{14}{3} \cdot \frac{8}{9}\) = \(\frac{112}{27}\) = \(4\frac{4}{27}\)

в) \(\frac{1,21}{3} \cdot \frac{2}{3} = \frac{121}{300} \cdot \frac{2}{3} = \frac{242}{900} = \frac{121}{450}\)

Ответ: а) \(\frac{1}{6}\); б) \(4\frac{4}{27}\); в) \(\frac{121}{450}\)