#include
     
      #include
      
       #define MIN 0.00001int main(){float a,b,c;scanf("%f %f %f",&a,&b,&c);if((a
       
        -MIN)){    printf("不是一元二次函数")；}else{    float disc=b*b-4*a*c;    if((disc
        
         -MIN))    {        printf("方程有两个相等的实根：\n");        printf("x1=x2=%f\n",-b/(2*a));    }    else if(disc>0.0)    {        printf("有两个不相等实根：\");        printf("x1=%f\n",(-b+sqrt(disc))/(2*a));        printf("x2=%f\n",(-b-sqrt(disc))/(2*a));    }         else         {             printf("有一组共轭复根\n");         }}return 0;}