已知6^a=5,则lg25/lg6等于
问题描述：
已知6^a=5,则lg25/lg6等于
答
6^a = 5
a = log(6 ,5) (6是底数,5是真数)
lg25/lg6
= log(6 ,25)
= log(6 ,5²)
= 2log(6,5)
= 2a