5p^3 : p^6 8^-5 : 8^-3 (5a) : (5a)^-2

5p^3 / p^6
= 5 p^3-6
= 5p^-3
= 5 / p^3

8^-5 / 8^-3
= 8^(-5) - (-3)
= 8^-2
= 1/8^2

5a / 5a^-2
= 5a^1-(-2)
= 5a^3

Semoga membantu dan semoga bermanfaat...