-(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](/uploads/image/z/8892201-57-1.jpg?t=-%28a%5E2-2ab%29%2A9a%5E2-%289ab%5E3%2B12a%5E2b%5E2%29%5C3ab)
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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^2b^2)\3ab
原式=-(9a^4-18a³b)-(3b²+4ab)
=-9a^4+18a³b-3b²-4ab