Ответ:
- \(7+\frac8{19}=7\frac8{19}\).
- \(\frac8{68}+9=\frac2{17}+9=9\frac2{17}\).
- \(3\frac5{16}+4\frac7{16}=7\frac{12}{16}=7\frac34\).
- \(12\frac8{13}-8\frac4{13}=4\frac4{13}\).
- \(5\frac{17}{21}-3\frac8{21}+4\frac7{21}=2\frac9{21}+4\frac7{21}=6\frac{16}{21}\).
- \(14\frac8{10}+5\frac1{10}-6\frac7{10}=19\frac9{10}-6\frac7{10}=13\frac2{10}=13\frac15\).
Ответ: 1) \(7\frac8{19}\); 2) \(9\frac2{17}\); 3) \(7\frac34\); 4) \(4\frac4{13}\); 5) \(6\frac{16}{21}\); 6) \(13\frac15\).
