#include<stdio.h>
#include<conio.h>
float tong(float, int);
float luythua(float, int);
float luythua(float x, int n)
{
float t = 1;
for(int i = 1; i <= n; i++)
{
t = t * x;
}
return t;
}
float tong(float x, int n)
{
float s = 0;
for(int i = 1; i <= n; i++)
{
s = s + luythua(x, i);
}
return s;
}
int main()
{
int n;
float x;
printf("\nNhap n: ");
scanf("%d", &n);
printf("\nNhap x: ");
scanf("%f", &x);
float ketqua = tong(x, n);
printf("\nTong: %f",ketqua);
getch();
return 0;
}