更新1:
為何log5(x) > 1才有意義呢?
log2(log3(log5(x)))有意義，則的範圍為何?
回答 (2)
2011-12-29 12:28 am
2011-12-28 7:43 pm
log2(log3(log5(x)))有意義
<==> log3(log5(x)) > 0
<==> log5(x) > 1
<==> x>5
<==> log3(log5(x)) > 0
<==> log5(x) > 1
<==> x>5
收錄日期: 2021-05-04 01:48:01
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20111228000016KK02060