find 下列數總和
1+5+9+.......+197=
answer in chinese plz thx
Maths Q P.6
2007-04-08 6:28 am
回答 (3)
2007-04-10 7:29 pm
1+5+9+................197=?
It is too easy!!
1) (1+197)x50÷2
2) 198x50÷2
3) 9900÷2
4) 4950
It is too easy!!
1) (1+197)x50÷2
2) 198x50÷2
3) 9900÷2
4) 4950
參考: mr
2007-04-08 6:47 am
首先計算項數:
(197-1)/(5-1) +1 =50
總和= (1+197)*50/2=4950
(197-1)/(5-1) +1 =50
總和= (1+197)*50/2=4950
收錄日期: 2021-04-13 00:56:36
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070407000051KK04691