(log5根号2*log49 81)/(log25 1/3*log7 4开3次方)=?

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(log5根号2*log49 81)/(log25 1/3*log7 4开3次方)=?

(log5根号2*log49 81)/(log25 1/3*log7 4开3次方)=(1/2log5 2*log7 9)/(1/2log5 1/3*1/3log7 4)=—3