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2010-01-07T22:43:52+01:00
[(x^3/4)^-2] / [(x^2/3)^-3] = x^(-6/4) / x^(-6/3) = x^(-3/2 + 2) = x^1/2

[(4r)^1/2 * r^1/2] / r^1/3 = 2r / r^1/3 = 2r^2/3

x^6/3 * x^1/2 / x^3/2 = x^2 * x^(1/2 - 3/2) = x^2 * x^-1 = x