如何证明logaM/logaN等于logbM/logbN

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如何证明logaM/logaN等于logbM/logbN如何证明logaM/logaN等于logbM/logbN如何证明logaM/logaN等于logbM/logbN提示:用换底公式.证:loga(

如何证明logaM/logaN等于logbM/logbN
如何证明logaM/logaN等于logbM/logbN

如何证明logaM/logaN等于logbM/logbN
提示:用换底公式.
证:
loga(m)/loga(n)
=(lgm/lga)/(lgn/lga)
=lgm/lgn
=logn(m)
logb(m)/logb(n)
=(lgm/lgb)/(lgn/lgb)
=lgm/lgn
=logn(m)
loga(m)/loga(n)=logb(m)/logb(n)