bt8a/buoi5

#include
#include

main()
{
int n, i;
float x, Tong;
printf("Nhap x= "); scanf("%f",&x);
printf("Nhap n= "); scanf("%d",&n);
Tong=0;
if (x==0) printf("Tong = 0\n");
else if (n==0) printf("Tong = 1\n");
else if (n>0)
{for (i=1;i<=n;i++) Tong= Tong+ pow(x,2*i) ;
printf("Tong = %f",Tong);
}
else printf("Khong tinh duoc");
}