№ 1 Вычислите: а) \(1\frac{2}{5}\cdot2\frac{1}{7}\); б) \(4\frac{1}{2}:1\frac{1}{8}\).

а) \(1\frac{2}{5}=\frac{7}{5}\), \(2\frac{1}{7}=\frac{15}{7}\).

\(\frac{7}{5}\cdot\frac{15}{7}=3\).

б) \(4\frac{1}{2}=\frac{9}{2}\), \(1\frac{1}{8}=\frac{9}{8}\).

\(\frac{9}{2}:\frac{9}{8}=\frac{9}{2}\cdot\frac{8}{9}=4\).

Ответ: а) 3; б) 4.