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问题: 比较大小~(不等式)

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解答:

log(2b)a = log(b)a/log(b)[2b]

log(b)a/log(2b)a
= log(b)a/{log(b)a/log(b)[2b]}
= log(b)[2b]
= 1 + log(b)2
>1

故 log(b)a>log(2b)a