公式：log(a)(b)*log(b)(a)=?

公式：log(a)(b)*log(b)(a)=? log(a)*log(b)=啥啊,忘记公式了啊 别告诉我等于log(b)*log(a) 1/log(a)(b)=log(b)(a)属于什么公式（是换底公式吗?怎样证明? 利用换底公式证明：log(a)b.log(b)c.log(c)a=1rt.是乘号 换底公式log[a]b=log[n]b/log[n]a中的n指什么,怎么算 求对数函数公式的推导log(a)(M^n)=nlog(a)(M) 和log(a)(N)=log(b)(N) / log(b)(a) 的推导 同底数对数相乘的计算公式?log（a）b * log（a）c=? 关于数学对数的换底公式推论的问题已知 log(2)(3) = a,log(3(7)=b,用a,b表示log(42)(56)因为log(2)(3)=a,则1/a=log(3)(2),又∵log(3)(7)=b,∴log(42)(56)=log(3)(56)/log(3)(42)=log(3)(7)+3·log(3)(2)/log(3)(7)+log(3)(2)+1=ab+3/ab+b+1 关于数学对数的换底公式推论的问题已知 log(2)(3) = a,log(3(7)=b,用a,b表示log(42)(56)因为log(2)(3)=a,则1/a=log(3)(2),又∵log(3)(7)=b,∴log(42)(56)=log(3)(56)/log(3)(42)=log(3)(7)+3·log(3)(2)/log(3)(7)+log(3)(2)+1=ab+3/ab+b+1 1≤a≤b≤c,证明log(a)(b)+log(b)(c)+log(c)(a)≤log(b)(a)+log(c)(b)+log(a)(c) 换底公式推导过程1.log(a)(b)=1/log(b)(a) 2.log(a^n)(b^m)=m/n*[log(a)(b)] 3.log(a)(M^n)=nlog(a)(M) 化简log(1/a)b+log(a)b log(a) (b ) 与log(b) (a)是什么关系 2^(log(a)(b))*8^(log(a)(b)) log(a)(b)=log(c)(b) /log(c)(a) 怎么证log(a)(b)=log(c)(b) /log(c)(a)怎么证 已知01比较log(a)(1/b),log(a)(b),log(b)(1/b)的大小 已知01.比较log a 1/b,log a b,log b 1/b的大小. 关于log的公式的证明请问下为什么a^log(b,n)=n^log(b,a)?怎么证明?（我这里用log(b,n)表示log以b为底n的对数）