ln [ (e^4)^(1/13) ]
= ln[ e^(4/13) ]
= (4/13) lne
= 4/13 。
ln(e^4)^(1/13)
=(1/13)lne^4
=1/13×4
=4/13
ln((e^4)^(1/13)
=lne^(4/13)
=0.30769230769230769230769230769231
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