定义：若a^n=b(a>0且a≠1) 则n=log(a)(b)公式如果a>0,且a≠1,M>0,N>0,那么：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)...