-4(a的平方-2ab)*9a的平方-(9ab的3次方+12a的4次方b的平方)/(3ab),
=-4(a²-2ab)*9a²-(9ab³+12a^4b^2)/(3ab)
=-36a^4+72a^3b-3b^2-4a^3b
=-36-72-12-8
=-128