换底公式：log（a底数）(B真数) = log(c任意底) (B真数) / log(c) (a真数）证明：设log(a) (B) = k, 则a^k = B. 两边取底数为c的对数得：log(c) (a^k) = log(c) (B), 故k log(c) (a) = log (c) (B), 所以k = log(c任意底) (B真数) / log(c) (a真数...
对数换底公式以及其两个推论看不懂，求教.
换底公式：log（a底数）(B真数) = log(c任意底) (B真数) / log(c) (a真数）
证明：设log(a) (B) = k, 则a^k = B. 两边取底数为c的对数得：log(c) (a^k) = log(c) (B), 故k log(c) (a) = log (c) (B), 所以k = log(c任意底) (B真数) / log(c) (a真数）2011-07-20
