... 指數加法定律, Bu + v =Bu Bv= x y;亦即 logB (x y)= u+ v= logB (x) + logB (y)。(另一半?)後者:若 logB (x)=u, xn =y,亦即Bu =x,因而(由指數乘法定律,)y=xn = (Bu)n ...
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