Ответ:

  1. \(a^5\cdot a^7=a^{12}\).
  2. \(m^7:m^4=m^3\).
  3. \((a^7)^5=a^{35}\).
  4. \((-3a)^3=-27a^3\).
  5. \(5c^4:c^4=5\).
  6. \(c^2\cdot c^2\cdot c^2=c^6\).
  7. \(c^4\cdot(c^5)^3=c^4\cdot c^{15}=c^{19}\).
  8. \(2^5\cdot4^6=2^5\cdot(2^2)^6=2^{17}\).
  9. \(100\cdot10^8=10^2\cdot10^8=10^{10}\).
  10. \((3c)^4:c^4=81\).
  11. \(2^6-2^3=64-8=56\).
  12. \(2^9:2^3=2^6=64\).
  13. \((c^8)^2\cdot(c^4)^5=c^{16}\cdot c^{20}=c^{36}\).
  14. \((2c)^5:c^5=2^5=32\).
  15. \(b\cdot b\cdot b=b^3\).
  16. \(25^4:5^4=(25:5)^4=5^4=625\).
  17. \(\frac{2^9}{2^7}=2^2=4\).