化简[12(a²b)b²+3a²(3a²b³-ab²)]÷(3a³b²)[12(a²b)b²+3a²(3a²b³-ab²)]÷(3a³b²)[12(a²b)³b²+3a²(3a²b³-ab²)]÷(3a³b²)不好意思

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