(log以4为底3的对数+log以8为底3的对数)×lg2/lg3
问题描述:
(log以4为底3的对数+log以8为底3的对数)×lg2/lg3
答
换底公式
原式=(lg3/lg4+lg3/lg8)×lg2/lg3
=(lg3/2lg2+lg3/3lg2)×lg2/lg3
=(1/2+1/3)×lg3/lg2×lg2/lg3
=5/6