#include<stdio.h>
#include<conio.h>
#include<math.h>
int main()
{
void clrscr();
float a1, b1, c1, a2, b2, c2;
float d, dx, dy, x, y;
printf(" Nhap cac he so \n");
printf("a1= "); scanf("%f", &a1);
printf("b1= "); scanf("%f", &b1);
printf("c1= "); scanf("%f", &c1);
printf("a2= "); scanf("%f", &a2);
printf("b2= "); scanf("%f", &b2);
printf("c2= "); scanf("%f", &c2);
d = a1*b2 - a2*b1;
dx = c1*b2 - c2*b1;
dy = a1*c2 - a2*1;
if (d)
{
x = dx/d;
y = dy/d;
printf("\n He phuong trinh co nghiem duy nhat (x,y)=(%.2f,%.2f)",x,y);
}
else if (dx) printf("\n He phuong trinh vo nghiem");
else printf ("\n He phuong trinh co vo so nghiem");
getch();
return 0;
}