loga(c)*logc(a)

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loga(c)*logc(a)loga(c)*logc(a)loga(c)*logc(a)loga(c)*logc(a)=lnc/lna*lna/lnc=1换底公式loga(b)=logc(b)/lo

loga(c)*logc(a)
loga(c)*logc(a)

loga(c)*logc(a)
loga(c)*logc(a)
=lnc/lna*lna/lnc
=1
换底公式
loga(b)=logc(b)/logc(a)