换底公式按下面的步骤。1、log(a)b=log(s)b/log(s)a (括号里的是底数)
2、设log(s)b=M,log(s)a =N,log(a)b=R,则s^M=b,s^N=a,a^R=b,
3、即(s^N)^R=a^R=b,s^(NR)=b,
4、所以M=NR,即R=M/N,log(a)b=log(s)b/log(s)a
换底公式按下面的步骤。1、log(a)b=log(s)b/log(s)a (括号里的是底数)
2、设log(s)b=M,log(s)a =N,log(a)b=R,则s^M=b,s^N=a,a^R=b,
3、即(s^N)^R=a^R=b,s^(NR)=b,
4、所以M=NR,即R=M/N,log(a)b=log(s)b/log(s)a