log9 16×log32 81=

分类: 作业答案 • 2022-07-10 23:44:16

问题描述：

log9 16×log32 81=

答

log9 16×log32 81
= (lg16 / lg9) × (lg81 / lg32)
= 4lg2 / (2lg3) × 4lg3 / (5lg2)
= 8/5