Diperlukan bantuannya. Mksh

= (125^1/2 x 3^1/3) / (81^4/3 x 5^-3/2)
= (5^3/2 x 3^1/3) / (3^16/3 x 5^-3/2)
= 5^3/2-(-3/2) x 3^1/3-16/3
= 5^6/2 x 3^-15/3
= 5^3 x 3^-5
= 125 / 243

jadi jawabannya C