Question 309037
[(a^-1/2) / (3a^2/3)]^-3

= (a^-1/2)^-3 / (3a^2/3)^-3
= a^3/2 /(3^-3 x a^-2)
= a^3/2 x 3^3 x a^2
= 27 a^7/2  (add the exponents 3/2 and 2 of the variable a)