Ответ:

  1. \(\frac7{15}+\frac2{15}=\frac9{15}=\frac35\).
  2. \(\frac{37}{46}-\frac{21}{46}=\frac{16}{46}=\frac8{23}\).
  3. \(5\frac{17}{36}+3\frac7{36}=8\frac{24}{36}=8\frac23\).
  4. \(17\frac{53}{63}-9\frac{32}{63}=8\frac{21}{63}=8\frac13\).

Ответ: 1) \(\frac35\); 2) \(\frac8{23}\); 3) \(8\frac23\); 4) \(8\frac13\).