负lg计算公式如下,若a^n=b(a>0且a≠1)

则n=log(a)(b)

基本性质:

1、a^(log(a)(b))=b

2、log(a)(MN)=log(a)(M)+log(a)(N)

3、log(a)(M÷N)=log(a)(M)-log(a)(N)

4、log(a)(M^n)=nlog(a)(M)