2/(3*4*5)+2/(4*5*6)+2/(5*6*7)+2/(6*7*8)+2/(7*8*9)+2/(8*9*10)

来源：百度知道 编辑：UC知道 时间：2024/06/21 04:07:13

2/(3*4*5)+2/(4*5*6)+2/(5*6*7)+2/(6*7*8)+2/(7*8*9)+2/(8*9*10) = 0.072222222222222

#include "stdio.h"
#define N 6
long fac(int a)
{
int n;
n=(a+2)*(a+3)*(a+4);
return(n);
}
main()
{
int i,t;
float s=0;
for(i=0;i<=N;i++)
{
t=fac(i);
s+=2.0/t;
}
printf("2/(3*4*5)+2/(4*5*6)+2/(5*6*7)+2/(6*7*8)+2/(7*8*9)+2/(8*9*10)=%.8f",s);
}

运行结果：
2/(3*4*5)+2/(4*5*6)+2/(5*6*7)+2/(6*7*8)+2/(7*8*9)+2/(8*9*10)=0.15555558