- \(\frac14+\frac7{15}=\frac{15+28}{60}=\frac{43}{60}\).
- \(3\frac4{21}-2\frac5{14}=\frac{67}{21}-\frac{33}{14}=\frac{134-99}{42}=\frac56\).
- \(1\frac{23}{44}\cdot\frac{16}{67}=\frac{67}{44}\cdot\frac{16}{67}=\frac4{11}\).
- \(\frac9{16}:2\frac4{27}=\frac9{16}:\frac{58}{27}=\frac9{16}\cdot\frac{27}{58}=\frac{243}{928}\).
- \(\frac56+2\frac14:\frac2{33}=\frac56+\frac94\cdot\frac{33}{2}=\frac56+\frac{297}{8}=\frac{935}{24}\).
- \(3\frac25\cdot\frac7{51}-\frac5{21}=\frac{17}{5}\cdot\frac7{51}-\frac5{21}=\frac7{15}-\frac5{21}=\frac{49-25}{105}=\frac8{35}\).
Ответ: 1) \(\frac{43}{60}\); 2) \(\frac56\); 3) \(\frac4{11}\); 4) \(\frac{243}{928}\); 5) \(\frac{935}{24}\); 6) \(\frac8{35}\).