3,9,15,21的通項
回答 (4)
2008-01-02 3:02 am
✔ 最佳答案
通項 : a + ( n - 1 ) d= 3 + ( n - 1 ) 6
= 3 + 6 ( n - 1 )
= 3 + 6n - 6
= 6n - 3
參考: My brain
2008-02-06 9:07 pm
Well Done ~
2008-01-02 12:54 am
T(1) = 3 = (1)(3)
T(2) = 9 = (3)(3)
T(3) = 15 = (5)(3)
T(4) = 21 = (7)(3)
T(n) = (2n-1)(3)
2008-01-01 16:55:17 補充：
做得幾清楚, 選我啦
T(2) = 9 = (3)(3)
T(3) = 15 = (5)(3)
T(4) = 21 = (7)(3)
T(n) = (2n-1)(3)
2008-01-01 16:55:17 補充：
做得幾清楚, 選我啦
收錄日期: 2021-04-21 13:15:50
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https://hk.answers.yahoo.com/question/index?qid=20080101000051KK02478