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