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#include<stdio.h> #include<conio.h> float deQuy(int n) { if(n == 1) return 1; float tong = 1; for(int i = 2; i <= n; i++) { tong += i; } return deQuy(n - 1) + 1/tong; } float deQuyDuoi(int n, float y = 1) { if(n == 1) return y; float tong = 1; for(int i = 2; i <= n; i++) { tong += i; } return deQuyDuoi(n - 1, y + 1.0/tong); } float khuDeQuy(int n) { float tong = 0; for(int i = 1; i <= n; i++) { float tong2 = 1; for(int j = 2; j <= i; j++) { tong2 += j; } tong += 1.0/tong2; } return tong; } int main() { int n; printf("\nNhap n: "); scanf("%d", &n); printf("\nDe quy(%d) = %f", n, deQuy(n)); printf("\nDe quy duoi(%d) = %f", n, deQuyDuoi(n)); printf("\nKhu de quy(%d) = %f", n, khuDeQuy(n)); getch(); return 0; }
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