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1 Answer

(rs)^-3/(r^2s^3)^2 =

                    1                    1

= --------------------- = -----------------                      {1/r^7s^9}

     r^3s^3r^4s^6                r^7s^9

 

x^-3 = 1/x^3

x^3x^4 = x^(3+4) = x^7

by Level 8 User (36.8k points)

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