log(A/B) = logA -logB

令 X = logA, Y = logB, Z=log(A/B) 。2x = A, 2= B, 2= A/B, 则有 2= A/B = 2/ 2= 2x-y ,有z = x-y,即 log(A/B) = logA - logB。

原文地址:https://www.cnblogs.com/wbb2109/p/5538808.html