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#include<stdio.h> #include<conio.h> int main() { int i, n; float S; S = 0; i = 1; do { printf("\nNhap n: "); scanf("%d", &n); if(n < 1) { printf("\nN phai lon hon hoac bang 1. Xin nhap lai !"); } }while(n < 1); while(i <= n) { S = S + 1.0 / (i * (i + 1)); i++; } printf("\nTong la %f", S); getch(); return 0; }
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