Ответ:

  1. \(\frac12+\frac23=\frac36+\frac46=\frac76=1\frac16\).
  2. \(3-\frac45=2\frac55-\frac45=2\frac15\).
  3. \(3\frac13+5\frac34=\frac{40}{12}+\frac{69}{12}=\frac{109}{12}=9\frac1{12}\).
  4. \(6\frac12-2\frac23=\frac{39}{6}-\frac{16}{6}=\frac{23}{6}=3\frac56\).
  5. \(\frac12\times\frac23=\frac13\).
  6. \(2\frac{2}{15}\times1\frac9{16}=\frac{32}{15}\times\frac{25}{16}=\frac{10}{3}=3\frac13\).
  7. \(\frac4{15}:\frac{12}{35}=\frac4{15}\times\frac{35}{12}=\frac79\).
  8. \(9:1\frac45=9:\frac95=9\times\frac59=5\).

Ответ: 1) \(1\frac16\); 2) \(2\frac15\); 3) \(9\frac1{12}\); 4) \(3\frac56\); 5) \(\frac13\); 6) \(3\frac13\); 7) \(\frac79\); 8) \(5\).