Find the sum of the geometric series ∞Σ(n=1) [(−2)^(n−1)]/(5^n), or show that it is divergent.?
回答 (1)
2016-03-28 7:36 am
✔ 最佳答案
SolS=2^0/5^1－2^1/5^2+2^2/5^4－2^3/5^4+…...
－2S/5=2^1/5^2－2^2/5^3+2^3/5^4－………..
------------------------------------------------------
3S/5=2^0/5^1
3S/5=1/5
S=1/3
收錄日期: 2021-04-29 12:04:33
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20160327211943AArAk9q