log2+log3=log6
如下图所示,是“4”的第一个公式的逆运算
解:应运换底公式
㏒a N=(㏒b N)/(㏒b a)
将上述式子转换
(Log4 3 Log8 3)*(Log3 2 Log9 2)
=[log4 3 (log4 3)/(log4 8)]×[log3 2 (log3 2/log3 9)]
=(log4 3 2/3log4 3)×(log3 2 1/2log3 2)
=(5/3log4 3)×(3/2log3 2)
=5/3log4 3×3/2×1/2/log4 3
=5/3×3/2×1/2=5/4