Question

下列指數(shù)式和對(duì)數(shù)式互化不正確的是（　�。�

A．3^x=1與log_x3=1

B．2^x=0.5與log₂0.5=x

C．x=log₅27與5^x=27

D．x=lg0.3與10^x=0.3

Answer 1

分析：利用指數(shù)式與對(duì)數(shù)的互化：a^b=N?log_aN=B（a＞0，a≠1，）即可得出．

解答：解：∵3^x=1化為對(duì)數(shù)式應(yīng)為lg₃1=x，故A不正確．
故選A．

點(diǎn)評(píng)：熟練掌握指數(shù)式與對(duì)數(shù)的互化：a^b=N?log_aN=B（a＞0，a≠1，）是解題的關(guān)鍵．