根据换底公式:log2为底9的对数=log3为底9的对数除以log3为底2的对数log3为底2的对数=log3为底2的对数除以log3为底3的对数两者相乘,约分后得
log3为底9的对数除以log3为底3的对数=3
取倒数比较
0 0<1/log3底2<1/log5底2 log3底2>log5底2 根据换底公式:log2为底9的对数=log3为底9的对数除以log3为底2的对数log3为底2的对数=log3为底2的对数除以log3为底3的对数两者相乘,约分后得 log3为底9的对数除以log3为底3的对数=3 对数的运算法则: 1、log(a) (M·N)=log(a) M+log(a) N 2、log(a) (M÷N)=log(a) M-log(a) N 3、log(a) M^n=nlog(a) M 4、log(a)b*log(b)a=1 5、log(a) b=log (c) b÷log (c) a扩展资料