Ответ:

  1. \(2\frac18+3\frac5{12}=5+\frac3{24}+\frac{10}{24}=5\frac{13}{24}\).
  2. \(5\frac{13}{15}+1\frac4{12}=6+\frac{13}{15}+\frac13=6+\frac{18}{15}=7\frac15\).
  3. \(7\frac38-3\frac56=4+\frac9{24}-\frac{20}{24}=3\frac{13}{24}\).

Ответ: 1) \(5\frac{13}{24}\); 2) \(7\frac15\); 9) \(3\frac{13}{24}\).