log以2为底20的对数-log以4为底25的对数等于多少!!求助

2025-06-27 20:26:03
推荐回答(1个)
回答1:

log2 (20)-log4 (25)
=log2 (5*4) -log2^2 (5^2)
=log2 (5)+log2 (4)-log2 (5)
=log2 (2^2)
=2