一條數學題
3＋9＋81＋．．．＋第5個＝？
俾個方法我！
3＋9＋81＋．．．＋第5個＝？
2007-05-12 11:55 am
回答 (6)
2007-05-12 12:03 pm
✔ 最佳答案
3＋9＋81＋．．．＋第5個＝？3 + 3^2 + 3^4 + 3^8 + 3^16 + 3^32 = 3 ^ (1+2+4+8+16+32) = 3 ^ 63
2007-05-12 04:06:36 補充：
= 43053375 (NOT) 3 ^ (1 2 4 8 16 32) = 3 ^ 63
2007-05-12 04:08:16 補充：
3 3^2 3^4 3^8 3^16= 343053375
2007-05-12 7:46 pm
3+9+81+6561+43046721=43053375
每個都係平方數"
3x3=9
9x9=81
81x81=6561
6561x6561=43053375
第5個數係43053375"
全是平方數!!
每個都係平方數"
3x3=9
9x9=81
81x81=6561
6561x6561=43053375
第5個數係43053375"
全是平方數!!
2007-05-12 2:41 pm
3+9+81+6561+43046721=43053375
3 + 3x3 + 9x9 + 81x81 + 6561x6561 = 43053375
3 + 3x3 + 9x9 + 81x81 + 6561x6561 = 43053375
2007-05-12 1:58 pm
3＋9＋81＋．．．＋第5個＝?
方法:
3+9+81+6561+43046721=43053375
3 + 3x3 + 9x9 + 81x81 + 6561x6561 = 43053375
方法:
3+9+81+6561+43046721=43053375
3 + 3x3 + 9x9 + 81x81 + 6561x6561 = 43053375
2007-05-12 12:04 pm
I gues the sequence should be:
9 = 3 x 3
6561 = 81 x 81
43046721 = 6561 x 6561
Answer should be:
3+9+81+6561+ 43046721=43053375
9 = 3 x 3
6561 = 81 x 81
43046721 = 6561 x 6561
Answer should be:
3+9+81+6561+ 43046721=43053375
參考: Myself
2007-05-12 12:00 pm
3+9+81+6561+43046721=43053375
收錄日期: 2021-04-29 22:52:24
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070512000051KK00576