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13 14 16 21 76

因为括号在中间,所以需要推测再验证 我们变式得: 13,14,16,21,(),76相邻之差得 1,2,5,(),() 又2=1*3-1 5=2*3-1 ()=5*3-1=14 ()=14*3-1=41 则2级数列为1,2,5,14,41 代入得原数列为13,14,16,21,35,76 验证无误认为3...

13+1=14 14+1+3^0=16 16+1+3^0+3^1=21 21+1+3^0+3^1+3^2=35 35+1+3^0+3^1+3^2+3^3=76

后台代码 using System;using System.Data;using System.Configuration;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web...

13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 ...76 77 78 79 80 /*#include void fun(int x); void main() ...

13,14,16,21,(35 ),76 13,14,16,21,(35 ),76两数之间的差为1,2,5,14,41. 1,2,5,14,41两数之间的差为1,3,9,27. 1,3,9,27.刚好是等比数列,公比为3

13,14,16,21,(35 ),76 13,14,16,21,(35 ),76两数之间的差为1,2,5,14,41. 1,2,5,14,41两数之间的差为1,3,9,27. 1,3,9,27.刚好是等比数列,公比为3

13,14,16,21,(35 ),76 13,14,16,21,(35 ),76两数之间的差为1,2,5,14,41.......... 1,2,5,14,41两数之间的差为1,3,9,27.......... 1,3,9,27..........刚好是等比数列,公比为3

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