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[" 12.If "log(10)7=a" ,then "log(10)((1)...

[" 12.If "log_(10)7=a" ,then "log_(10)((1)/(70))" is equal to: "],[[" (A) ",-(1+a)," (B) ",(1+a)^(-1)],[," (C) "," (D) ",(1)/(10a)]]

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