Ответ:

  1. \(a^{1/3}\cdot a^{1/2}=a^{5/6}\);
  2. \(b^{1/2}\cdot b^{1/3}\cdot b^{1/6}=b\);
  3. \(b^{1/3}:b^{1/6}=b^{1/6}\);
  4. \(a^{4/3}:a^{1/3}=a\);
  5. \(x^{1.7+2.8-2.5}=x^2\);
  6. \(y^{-3.8}:y^{-2.3}\cdot y^{1/3}=y^{-3.8+2.3+1/3}=y^{-7/6}\).