1/12×13 + 1∕13×14 + 1∕14x15...............+ 1∕19×20 = 1∕a
a=?
趣味IQ題(Maths)
2007-03-19 6:11 am
回答 (2)
2007-03-19 6:19 am
參考: My Maths knowledge
2007-03-20 4:18 am
A=30
好easy!!
好easy!!
收錄日期: 2021-04-12 23:35:54
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070318000051KK05499