Ответ:
а) \(7\frac{1}{4}\cdot8=\frac{29}{4}\cdot8=58\).
б) \(5\frac{2}{3}\cdot6=\frac{17}{3}\cdot6=34\).
в) \(4\cdot1\frac{1}{2}=4\cdot\frac{3}{2}=6\).
г) \(35\frac{2}{5}:5=\frac{177}{5}:5=\frac{177}{25}=7\frac{2}{25}\).
д) \(80\frac{1}{5}\cdot\frac{1}{20}=\frac{401}{5}\cdot\frac{1}{20}=\frac{401}{100}=4\frac{1}{100}\).
Ответ: а) 58; б) 34; в) 6; г) \(7\frac{2}{25}\); д) \(4\frac{1}{100}\).
