求对数解答题．．证明,log(b)A＝1／log(a)B
问题描述：
求对数解答题．．
证明,
log(b)A＝1／log(a)B
答
log(b)a=log(a)a/log(a)b
=1/log(a)b; {因为log(a)a=1}
答
用换底公式
log(B)A=log(C)B/log(C)A
log(A)B=log(C)A/log(C)B
所以log(B)A＝1／log(A)B