lg(2)=a,lg(3)=b,求log5(60)
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lg(2)=a,lg(3)=b,求log5(60)
lg(2)=a,lg(3)=b,求log5(60)
lg(2)=a,lg(3)=b,求log5(60)
log5(60) =lg(60)/lg(5) =lg(6*10)/lg(10/2) =(lg6+lg10)/(lg10-lg2) =(lg2+lg3+lg10)/(lg10-lg2) =(a+b+1)/(1-a)