#include<stdio.h>
#include<math.h>
int main()
{
    double a,b,c,d,x1,x2;
    printf("请输入a,b,c系数\n");
    scanf("%lf%lf%lf",&a,&b,&c);
    d==b*b-4*a*c;
    if(a==0)
    {
        x1=(-c)*(1.0/b);
        printf("%lf",x1);
        
    }
        else if(d==0)
        {
        x1=(-b)/((1.0)/(2*a));
        printf("%lf",x1);
        }
          else if(d>0)
         {
          x1=(-b)*(1.0/(2*a))+sqrt(d)/(2*a);
          x2=(-b)*(1.0/(2*a))-sqrt(d)/(2*a);
          printf("%lf,%lf",x1,x2);   
         }
         
          else
          {
               x1=(-b)*(1.0/(2*a)),x2=(-b)*(1.0/(2*a));
               d=sqrt(-d)/(2*a);
                printf("%lf+%lfi,%lf-%lfi",x1,d,x2,d);
            }
}