1÷lg√2=lg10÷lg√2=lg10÷1/2lg2=2lg10/lg2=2log(2)(10)利用了：log(a)(b^m)=mlog(a)(b)log(a)(c)÷log(a)(d)=log(d)(c)明教为您解答,请点击[满意答案];如若您有不满意之处,请指出,我一定改正!希望还您一个正确答...