Question

输入整数n,计算表达式:1-1/(1*2)+1/(2*3)-1/(3*4)+...+1/(n*(n+1))的值

哪位大神知道怎么做，用编程语言

Answer 1

#include <stdio.h>
void main(){
int i,n;double d=-1,k,s=1;
scanf("%d",&n);
for(i=1;i<=n;i++)
{k=d/(i*(i+1));s+=k;d=-d;}
printf("%lf",s);
}

Answer 2

=1/（n+1）-1/n+1/n-1/(n-1)...+1=1/(n+1)