first term
↓ fifth term
↓ ↓
e.g. 1、4、9、16、25......first term is 1x1=1 、second term is 2x2=4、general term is n二次方
e.g. 2、4、6、8、10......first term is 2X1=2、second term is 2X2=4、general term is 2n
幫我計!!
1、3、5、7、9...... general term is ?????
2、5、10、17、26...... general term is ???
1、3、6、10、15...... general term is?????
規律問題!!!
2007-10-17 2:04 am
回答 (2)
2007-10-17 2:19 am
✔ 最佳答案
1.Difference=2First term=1
General term =1+2(n-1)
2n-1
2. Difference=5-2=3
First term=2
General term=2+3(n-1)
3n-1
3. The numbers (1,3,6..) are triangular numbers
General term: obviously n(n+1)/2
2007-10-18 4:49 am
1、3、5、7、9...... general term is 單數
2、5、10、17、26...... general term is +3, +5, +7...
1、3、6、10、15...... general term is +2, +3, +4...
2、5、10、17、26...... general term is +3, +5, +7...
1、3、6、10、15...... general term is +2, +3, +4...
參考: me
收錄日期: 2021-04-13 13:56:43
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071016000051KK02226