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((r^1/5 * s^2/3)^1/5)/r^2
--> powers raised to powers is when we multply the powers
--> (r^(1/5 * 1/5) * s^(2/3 * 1/5))/r^2
--> (r^1/25 * s^2/15)/r^2
--> now dividing we'll subtract the power
--> r^(1/25 - 2) * s^2/15
--> r^(-49/45)*s^(2/15)
decent?