a1=1
a2=-1
a3=1
a4=-1......
an=?
a1=1 over 2‧5
a2=1 over 5‧8
a3=1 over 8‧11
a4=1 over 11‧14......
an=?
a1=-1
a2=3
a3=-5
a4=7
an=?
數學!!急 數列
2012-10-20 5:52 am
回答 (3)
2012-10-20 6:23 am
Do you want a_n expressed in n or a_(n-1) ?
2012-10-20 5:53 am
1.1
other i don't know
other i don't know
收錄日期: 2021-04-13 19:03:36
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20121019000051KK00555