log2(log3(log5(x)))有意義,則的範圍為何?

2011-12-28 7:18 pm
log2(log3(log5(x)))有意義,則的範圍為何?2,3,5為底數
更新1:

為何log5(x) > 1才有意義呢?

回答 (2)

2011-12-29 12:28 am
✔ 最佳答案

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2011-12-28 7:43 pm
log2(log3(log5(x)))有意義
<==> log3(log5(x)) > 0
<==> log5(x) > 1
<==> x>5


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