-(a²-2ab)·9a²-(9ab三次方+12a四次方b²)÷3ab,其中a=-1,b=-2
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![-(a²-2ab)·9a²-(9ab三次方+12a四次方b²)÷3ab,其中a=-1,b=-2](/uploads/image/z/3813527-47-7.jpg?t=-%EF%BC%88a%26sup2%3B-2ab%EF%BC%89%C2%B79a%26sup2%3B-%EF%BC%889ab%E4%B8%89%E6%AC%A1%E6%96%B9%2B12a%E5%9B%9B%E6%AC%A1%E6%96%B9b%26sup2%3B%EF%BC%89%C3%B73ab%2C%E5%85%B6%E4%B8%ADa%3D-1%2Cb%3D-2)
-(a²-2ab)·9a²-(9ab三次方+12a四次方b²)÷3ab,其中a=-1,b=-2
-(a²-2ab)·9a²-(9ab三次方+12a四次方b²)÷3ab,其中a=-1,b=-2
-(a²-2ab)·9a²-(9ab三次方+12a四次方b²)÷3ab,其中a=-1,b=-2
-(a²-2ab)·9a²-(9ab三次方+12a四次方b²)÷3ab
=-9a^4+18a^3b-3b^2-4a^3b
=-9a^4+14a^3b-3b^2
a=-1,b=-2带入
原式=-9+28-12=7
原式=-9a^4+18a^3b-3b^2-4a^3b=14a^3b-9a^4-3b^2=7