giaiPTbac2

#include <stdio.h>
int main()
{
float a,b,c,delta,x1,x2,x3,x4;
printf("Nhap a: "); scanf("%f",&a);
printf("Nhap b: "); scanf("%f",&b);
printf("Nhap c: "); scanf("%f",&c);
while (a!=0)
{
delta=b*b - 4*a*c;
x1=(-b-sqrt(delta))/(2*a);
X2=(-b+sqrt(delta))/(2*a);

x3=(-b/(2*a))-(sqrt(delta)/(2*a));
x4=(-b/(2*a))+(sqrt(delta)/(2*a));

if(delta>0)
{
printf("PT co 2 nghiem phan biet:\n");
printf("x1= %.2f | x2= %.2f\n",x1,x2);
}
else if(delta==0)
{
printf("PT co nghiem kep: x1=x2= %.2f\n",-b/(2*a));
}
else
{
printf("PT co 2 nghiem phuc:\n");
printf("x1= %.2fi | x2= %.2fi\n",x3,x4);
}
return 0;
}