logab\logac=?

logab\logac=?
logab\logac=?

logab\logac=?
loga b=lgb/lga
loga c=lgc/lga
所以
logab\logac=lgb/lga/(lgc/lga)=lgb/lga×lga/lgc=lgb/lgc=logc b
希望对您有所帮助