log 8 16=x 怎么解

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用换底公式x=log 8 16=lg16/lg8=(4lg2]/(3lg2)=4/3
======以下答案可供参考======
供参考答案1:
x= (log 2 16) / (log 2 8) = 4/3
供参考答案2:
log 8 16 = log8 (2*8) = 1+ log 8 2 = 1+ log 2^3 2 = 1+1/3
所以 x =4/3