Lily is building towers of playing cards with more and more storeys.
http://upload.lsforum.net/users/public/h23905card1i192.gif
Find the difference between the number of cards in the n-storey card tower and the (n-1)-storey card tower.
Ans.:
http://upload.lsforum.net/users/public/t4643card2n192.gif
我唔明點解係5+3(n-2)而不是5+3(n-1)...
希望大家能幫忙解釋一下,thz!
1條dse數學問題
2012-10-26 7:53 am
回答 (1)
2012-10-26 9:07 am
✔ 最佳答案
T(1) = 2T(2) = 2+5 = 7
T(3) = 2+5+8 = 15
T(2) - T(1) = 5 ... d(1) = 5
T(3) - T(2) = 8 ... d(2) = 5+3(1)
T(4) - T(3) = 11 . d(3) = 5+3(2)
...
T(n) - T(n-1) = d(n-1) = 5+3(n-1-1) = 5+3(n-2)
If you don't understand, pm me la
參考: maeducation.edu.hk
收錄日期: 2021-04-23 21:20:56
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20121025000051KK00669