a) $$3\frac{3}{7} \cdot 1\frac{1}{6} = \frac{24}{7} \cdot \frac{7}{6} = \frac{24}{6} = 4$$
б) $$2\frac{2}{3} : 1\frac{1}{3} = \frac{8}{3} : \frac{4}{3} = \frac{8}{3} \cdot \frac{3}{4} = \frac{8}{4} = 2$$
Ответ: a) 4; б) 2