Ответ:
\(2\frac{1}{3}\cdot1\frac{1}{7}=\frac{7}{3}\cdot\frac{8}{7}=\frac{8}{3}=2\frac{2}{3}\).
\(5\frac{1}{4}:\frac{3}{4}=\frac{21}{4}\cdot\frac{4}{3}=7\).
\(3\frac{3}{5}\cdot1\frac{1}{9}=\frac{18}{5}\cdot\frac{10}{9}=4\).
\(2\frac{2}{5}:1\frac{1}{5}=\frac{12}{5}:\frac{6}{5}=\frac{12}{5}\cdot\frac{5}{6}=2\).
\(4\frac{1}{2}:1\frac{1}{2}=\frac{9}{2}:\frac{3}{2}=\frac{9}{2}\cdot\frac{2}{3}=3\).
Ответ: а) 2 2/3; б) 7; в) 4; г) 2; д) 3.
