log(a)(b)=1/log(b)(a)log(a)(N)=log(b)(N)÷log(b)(a)1、a^(log(a)(b))=b 　　2、log(a)(a^b)=b　　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) ...