Ответ:\(1\frac{1}{2}\cdot2\frac{2}{3}=\frac{3}{2}\cdot\frac{8}{3}=4\).\(2\frac{1}{4}\cdot1\frac{1}{3}=\frac{9}{4}\cdot\frac{4}{3}=3\).\(3\frac{1}{5}\cdot5=\frac{16}{5}\cdot5=16\).\(1\frac{5}{7}\cdot1\frac{1}{6}=\frac{12}{7}\cdot\frac{7}{6}=2\).