(log以2为底5的对数+log以4为底1/5的对数)(log以5为底2的对数+log以25为底1/2的对谢谢了,
问题描述:
(log以2为底5的对数+log以4为底1/5的对数)(log以5为底2的对数+log以25为底1/2的对谢谢了,
(log以2为底5的对数+log以4为底1/5的对数)(log以5为底2的对数+log以25为底1/2的对数)
答
(log以2为底5的对数+log以4为底1/5的对数)(log以5为底2的对数+log以25为底1/2的对数) =(log以2为底5的对数-1/2log以2为底5的对数)(log以5为底2的对数-1/2log以5为底2的对数) =1/2 log以2为底5的对数*1/2log以5为底2的对数 =1/4 根据对数的公式就能推出来了