# include <stdio.h>
# include <math.h>

int main (void)
{
	int a =1;
	int b =5;
	int c =6;
	double delta;
	double x1;
	double x2;

	delta = b*b-4*a*c;

	if (delta >0)
	{x1 =(-b+sqrt(delta)) / (2*a);
     x2 =(-b-sqrt(delta)) / (2*a);
	 printf("该一元二次方程有两个解，x1 = %lf, x2 = %lf\n", x1,x2); //此处已修改好
	}
	else if (delta==0)
	{x1 =(-b) / (2*a);
	x2=x1;
	printf("该一元二次方程有一个解，x1 = x2 = %lf\n", x1); //此处已修改好
	}
    else
	{
		printf("无解\n");
		return 0;
	}
}