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

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(3a^2b)^3/(-3a^3b)^2(3a^2b)^3/(-3a^3b)^2(3a^2b)^3/(-3a^3b)^2=27a^6b^3/(9a^6b^2)=3b(3a^2b)^3/(-3a^3b)

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

(3a^2b)^3/(-3a^3b)^2
=27a^6b^3/(9a^6b^2)
=3b

(3a^2b)^3/(-3a^3b)^2
=(27a^6b^3)/(9a^6b^2)
=3b


原式
=(12a^6b^5+9a^4b³-3a³b²)/(3a³b²)
=(3a³b²)(4a³b³+3ab-1)/(3a³b²)
=4a³b³+3ab-1
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