已知4a²-4a+1+9b²+12b+4=0 求3a²b+2ab²-a²b²的值
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已知4a²-4a+1+9b²+12b+4=0 求3a²b+2ab²-a²b²的值
已知4a²-4a+1+9b²+12b+4=0 求3a²b+2ab²-a²b²的值
已知4a²-4a+1+9b²+12b+4=0 求3a²b+2ab²-a²b²的值
4a²-4a+1+9b²+12b+4=(2a-1)^2+(3b+2)^2=0
所以a=1/2,b=-2/3,ab=-1/3
3a²b+2ab²-a²b²=ab(3a+2b-ab)=-1/6
4a²-4a+1+9b²+12b+4=0
(2a-1)^2+(3b+2)^2=0
a=1/2
b=-2/3
剩下的就自己求吧