(-3a^3b^2)^2*(-2ab^2)^3/(9a^5b^4)

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(-3a^3b^2)^2*(-2ab^2)^3/(9a^5b^4)
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(-3a^3b^2)^2*(-2ab^2)^3/(9a^5b^4)
(-3a^3b^2)^2*(-2ab^2)^3/(9a^5b^4)

(-3a^3b^2)^2*(-2ab^2)^3/(9a^5b^4)
(-3a^3b^2)^2*(-2ab^2)^3/(9a^5b^4)
=9a^6b^4*(-8a^3b^6)/(9a^5b^4)
=a*(-8a^3b^6)
=-8a^4b^6