log(a)b=log(c)b/log(c)a 是怎么推算来的

log a b*log b c=log b b*log a c成立吗 log(a)(b)=log(c)(b) /log(c)(a) 怎么证 a^[log(a)b×log(b)c×log(c)N] 利用换底公式证明：log(a)b.log(b)c.log(c)a=1 对数函数题 log a - log b = 3 log (c/2) 求 a = ______________ 2log(b)x=log(a)x+log(c)x 1≤a≤b≤c,证明log(a)(b)+log(b)(c)+log(c)(a)≤log(b)(a)+log(c)(b)+ log(a)(b)+log(a)(c)可以等于什么 2^a=log(1/2)a,(1/2)^b=log(1/2)b,(1/2)^c=log(2)c,比较a,b,c的大小 设a，b，c是直角三角形的三边长，其中c为斜边，且c≠1，求证：log（c+b）a+log（c-b）a=2log（c+b 求证明 a^(log(c)(b))=b(log(c)(a)) 设A^2+B^2=C^2 求证 log以（C+B）为底A的对数+log(C-B)A=2log(C+B)*log(C-B)