计算:log以4为底8的对数减log以9为底1/27的对数+log以根号2为底4的对数=?
问题描述:
计算:log以4为底8的对数减log以9为底1/27的对数+log以根号2为底4的对数=?
答
原式
= lg8 / lg4 - lg (1/27) / lg9 + lg4 / lg2
=1.5 - (-1.5) + 2
=5