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能比出大小么

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isee posted 2013-9-30 17:46 |Read mode
题:比较$a,b$大小,其中$a={(\frac 12)}^{0.2},b=\log_54$。

其中的$a$次数可能是试卷印刷有误,猜出题的意图本为$-0.2$次。

如果就是 $a={(\frac 12)}^{0.2},b=\log_54$ 有没可行的办法?

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