Question

How do I express my question's answer, ab^2/1/a^2b^3 using only positive exponents?

Answer 1

ab^2/(1/a^2b^3)
=(ab^2)(a^2b^3)
=a^3 b^5

but if it is just what you say that
ab^2/(a^1/2 b^1/3)
=a^(1- 1/2) b^(2- 1/3)
=a^1/2 b^5/3