都是根据对数性质,如下：
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)
5、log(a^n)M=1/nlog(a)(M)
6、log(a^n)(b^m)=m/n*[log(a)(b)
7、log(a)(N)=log(b)(N)÷log(b)(a)