Ответ:\(4\frac{1}{2}:1\frac{1}{2}=\frac{9}{2}:\frac{3}{2}=3\).\(2\frac{2}{3}:\frac{8}{9}=\frac{8}{3}\cdot\frac{9}{8}=3\).\(5\frac{1}{4}:7=\frac{21}{4}:7=\frac{3}{4}\).