loga(b)×log(a)c＝?

loga(b)×log(a)c＝? 证明log b/loga+logc/logb+loga/logc>=3（a,b,c>1) 设a>b>1,且loga(b)+log(b)a=10/3,求loga(b)-log(b)a LOG （1／a ）b+LOGa b 化简 已知log(a*b)等于loga+logb,那么log(a+b)等于什么如题 loga(b)*loga(c)=? log a 2+log a 2分之1log3 18-log3 22log5 25-3log2 64已知lg2=a lg3=b求下列各式的值1.lg6 2.log3 4 3.log2 12 4.lg2分之3已知X的对数,求X1.lgx=lga+lgb 2.loga x=loga m-loga n3.lgx=31gn-lgm 4.loga x=2分之1loga b-loga c呵呵 不好意思 1≤a≤b≤c,证明log(a)(b)+log(b)(c)+log(c)(a)≤log(b)(a)+log(c)(b)+log(a)(c) 设loga底c,logb底c是方程x-3x+1=0的两根,求log(a/b)底c的值 log(A*B)=logA+logB log(A/B)=logA-logB 这两个公式可以倒过来使用吗?记不太清楚嘞~ log(a)(b)=log(c)(b) /log(c)(a) 怎么证log(a)(b)=log(c)(b) /log(c)(a)怎么证 log(a-b)展开=?是不是等於loga÷logb? log(a)(b)+log(a)(c)可以等于什么 怎么证明loga(b)-loga(c)=loga(b/c) log(a)b=log(c)b/log(c)a 是怎么推算来的 a^[log(a)b×log(b)c×log(c)N]求值 求对数的解答题!求值.log(b)A*log(c)B*log(a)C 2log(b)x=log(a)x+log(c)x求证,c^2=(ac)^[log(a)b]