求对数的解答题!求值.log(b)A*log(c)B*log(a)C

问题描述:

求对数的解答题!
求值.
log(b)A*log(c)B*log(a)C

log(b)a*log(c)b*log(a)c
=(lga/lgb)*(lgb/lgc)*(lgc/lga)
=1

log(b)A*lob(c)B*lob(a)C
=(lnA/lnb)*(lnB/lnc)*(lnC/lna)
若A=a,B=b,C=c,则
原式=lna*lnb*lnc/(lna*lnb*lnc)=1