由幂的对数的运算性质可得(推导公式) 1.log(a)M^(1/n)=(1/n)log(a)M ,log(a)M^(-1/n)=(-1/n)log(a)M 2.log(a)M^(m/n)=(m/n)log(a)M ,log(a)M^(-m/n)=(-m/n)log(a)M 3.log(a^n)M^n=log(a)M ,log(a^n)M^m=(m/n)log(a)M 4.log(以 n次根号下的a 为底)(以 n次根号下的M 为真数)=log(a)M , log(以 n次根号下的a 为底)(以 m次根号下的M 为真数)=(n/m)log(a)M 5.log(a)b×log(b)c×log(c)a=1