对数:log(4)8-log(1/9)3 求值

问题描述:

对数:log(4)8-log(1/9)3 求值

log(4)8-log(1/9)3
=lg8/lg4-lg3/lg1/9
=lg2×4/2lg2-lg3/(-2×lg3)
=4/2+1/2
=5/2