The 2nd and 6th term of a geometric progression are 1/4 and 4 respectively. Find
a) the common ratio
b) the first term
c) the general term(通項)
maths_等比級數
2009-04-18 11:06 pm
回答 (1)
2009-04-19 1:13 am
✔ 最佳答案
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(c)
For R=2,
T(n)=(2-3)(2n-1)
T(n)=2n-4
For R=-2,
T(n)=(-2-3)(-2n-1)
T(n)=(-2)n-4
收錄日期: 2021-04-13 16:34:14
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090418000051KK01126