(3a^2b^-1)^3(1/2a^-1b^2)^2
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(3a^2b^-1)^3(1/2a^-1b^2)^2
(3a^2b^-1)^3(1/2a^-1b^2)^2
(3a^2b^-1)^3(1/2a^-1b^2)^2
(3a^2b^-1)^3*(1/2a^-1b^2)^2
=27a^6*b^(-3)*1/4a^(-2)^b^4
=27/4*a^4*b