Ответ:

  1. \((b^4)^3=b^{12}\).
  2. \((-b^6)^2=b^{12}\).
  3. \(b^5b^4=b^9\).
  4. \((b^5)^4=b^{20}\).
  5. \(((b^7)^3)^2=b^{42}\).
  6. \((b^8)^7:b^{24}=b^{56-24}=b^{32}\).
  7. \((b^6)^3\cdot(b^2)^4=b^{18+8}=b^{26}\).
  8. \((b^5)^3\cdot(b^4)^7:b^{12}=b^{15+28-12}=b^{31}\).
  9. \(b^{32}:(b^9)^3\cdot b=b^{32-27+1}=b^6\).