举报
我又说实话了
此题目我做错了, lg2×lg10+lg10÷lg5 =lg2+1/lg5 =1-lg5+1/lg5 =1.7317065537373742458838 应该为无理数。 以下为对数的计算公式,请参考 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