log2(5) ×log5(8)=3步骤

问题描述:

log2(5) ×log5(8)=3步骤

log2(5) ×log5(8)
=(lg5)/(lg2)×(lg8)/(lg5)
=(lg8)/(lg2)
=(lg2^3)/(lg2)
=3lg2/lg2
=3