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- // Tinh S(n) = 1/2 + 1/4 + ... + 1/n
- // Khai bao ham thu vien
- #include<stdio.h>
- #include<conio.h>
- void main()
- {
- // khai bao bien
- int n;
- // nhap du lieu
- scanf("%d",&n);
- float s=0;
- for(int i=1; i<=n;i++)
- {
- if(i%2==0)
- {
- s=s+ (float) 1/i;
- }
- }
- printf("%.2f",s);// lay 2 gia tri thap phan
- }
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