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[" 16.(a) "9:31" (b) "10:21(" c) "31" ."...

[" 16.(a) "9:31" (b) "10:21(" c) "31" ."],[[" If "a+b+c=13,a^(2)+b^(2)+c^(2)=69," then "(ab+bc+ca)],[=?]]

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|(a,b,c),(a^(2),b^(2),c^(2)),(bc,ca,ab)|=