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[" 28.If "a,b,c" are the roots of the equation "],[x^(3)-3x^(2)+3x+7=0" ,then the value of "],[[x^(3)-3x^(2)+3x+7=0" ,then the value of "],[[2bc-a^(2),c^(2)],[c^(2),2ac-b^(2)],[b^(2),a^(2),2ab-c^(2)]|" is "],[[" (a) "9," (b) "27," (c) "81]]]

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