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根號6a-12>=0 6a-12>=0, (2b+2)平方>=0 /6-4c/>=0 根號6a-12+(2b+2)平方+/6-4c/=0 ∴6a-12=0,a=2 2b+2=0,b=-1 6-4c=0,c=1.5 2abc=2x2x(-1)x1.5=-6
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