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Re: 提出一个数学递推公式,只有部分正确还请大虾们指点。

Posted by Sxxxxxx at 2006-08-23 11:10:30 on Problem 1320
In Reply To: 提出一个数学递推公式,只有部分正确还请大虾们指点。 Posted by:00448312 at 2005-04-29 15:00:10
> 程序如下:
> # include< iostream.h >
> # include< math.h >
> void main()
> {
> 	int a[10]={6,35};
> 	 
> 	for( int i=2; i<10; i++ )
> 		a[i] = a[i-1]*6 - a[i-2];// 计算第一个数的递推公式;
> 	for( i=0; i<10; i++ )
> 	{
> 		cout<<a[i]<<" ";
> 		cout<<( sqrt( 1 + 8*pow(a[i],2) )-1 )/2;
> 		cout<<endl;
> 	}
> 
> }
> // 注:此程序能够正确而快速的算出6个数据,后面的数据尽管也符合要求,但却不是按照顺序来的

a[i] = a[i-1]*6 - a[i-2]这个递推公式是怎么来的?

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