(a^2/3×b^-1/3)/(a^-1/3×b^-1/3)

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(a^2/3×b^-1/3)/(a^-1/3×b^-1/3)
(a^2/3×b^-1/3)/(a^-1/3×b^-1/3)

(a^2/3×b^-1/3)/(a^-1/3×b^-1/3)

a