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[" 19.Let "3f(x)-2f((1)/(x))=x" ,then "f...

[" 19.Let "3f(x)-2f((1)/(x))=x" ,then "f'(2)=],[[" (A) "(2)/(7)," (B) "(1)/(2)],[" (C) "2," (D) "(7)/(2)]]

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