Ответ:
- \(6\frac{1}{8}\cdot1\frac{2}{7}=\frac{49}{8}\cdot\frac{9}{7}=\frac{63}{8}=7\frac{7}{8}\).
- \(\frac34:\,1\frac78+\frac3{10}=\frac34:\frac{15}{8}+\frac3{10}=\frac34\cdot\frac8{15}+\frac3{10}=\frac25+\frac3{10}=\frac7{10}\).
- \(3\frac18\cdot4-5\frac12:3\frac23=\frac{25}{8}\cdot4-\frac{11}{2}:\frac{11}{3}=\frac{25}{2}-\frac{11}{2}\cdot\frac3{11}=\frac{25}{2}-\frac32=11\).
- \(13{,}85-(8{,}6-5{,}27+0{,}47)=13{,}85-3{,}8=10{,}05\).
Ответ: а) \(7\frac78\); б) \(\frac7{10}\); в) \(11\); г) \(10{,}05\).
