Ответ:
- \(2\frac{5}{7}\cdot14=\frac{19}{7}\cdot14=38\).
- \(8\frac{2}{5}\cdot6\frac{3}{7}=\frac{42}{5}\cdot\frac{45}{7}=54\).
- \(2\frac{5}{27}\cdot\frac{5}{9}=\frac{59}{27}\cdot\frac{5}{9}=\frac{295}{243}=1\frac{52}{243}\).
- \(\frac{10}{21}\cdot5=\frac{50}{21}=2\frac{8}{21}\).
- \(2\frac{2}{3}\cdot1\frac{1}{7}=\frac{8}{3}\cdot\frac{8}{7}=\frac{64}{21}=3\frac{1}{21}\).
Ответ: а) 38; б) 54; в) \(1\frac{52}{243}\); г) \(2\frac{8}{21}\); д) \(3\frac{1}{21}\).
