-(a^2-2ab)*9a^2-(9ab^3+12a^2b^2)\3ab

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-(a^2-2ab)*9a^2-(9ab^3+12a^2b^2)\3ab-(a^2-2ab)*9a^2-(9ab^3+12a^2b^2)\3ab-(a^2-2ab)*9a^2-(9ab^3+12a^2

-(a^2-2ab)*9a^2-(9ab^3+12a^2b^2)\3ab
-(a^2-2ab)*9a^2-(9ab^3+12a^2b^2)\3ab

-(a^2-2ab)*9a^2-(9ab^3+12a^2b^2)\3ab
原式=-(9a^4-18a³b)-(3b²+4ab)
=-9a^4+18a³b-3b²-4ab