17.
а) \(\frac56+\frac14=\frac{10}{12}+\frac3{12}=\frac{13}{12}=1\frac1{12}\);
б) \(\frac78-\frac56=\frac{21}{24}-\frac{20}{24}=\frac1{24}\);
в) \(\frac3{10}-\frac4{15}=\frac9{30}-\frac8{30}=\frac1{30}\);
г) \(5-3\frac27=5-\frac{23}{7}=\frac{12}{7}=1\frac57\);
д) \(\frac49\cdot\frac38=\frac16\);
е) \(\frac58:\frac9{10}=\frac58\cdot\frac{10}{9}=\frac{25}{36}\);
ж) \(2\frac67:1\frac37=\frac{20}{7}:\frac{10}{7}=2\);
з) \(6\frac35\cdot10=\frac{33}{5}\cdot10=66\).
