lnx+ lny=lnxy
lnx-lny=ln(x/y)
lnxⁿ=nlnx
ln(ⁿ√x)=lnx/n
lne=1
ln1=0 对数函数的运算法则公式:
1、a^log(a)(b)=b
2、log(a)(a)=1
3、log(a)(mn)=log(a)(m)+log(a)(n);
4、log(a)(m÷n)=log(a)(m)-log(a)(n);
5、log(a)(m^n)=nlog(a)(m)
6、log(a)[m^(1/n)]=log(a)(m)/n
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