#include<math.h>
void main()
{
double a,b,c,m,x1,x2;
cout<<"a=";
cin>>a;
cout<<"b=";
cin>>b;
cout<<"c=";
cin>>c;
m=b*b-4*a*c;
if(m>=0)
{ x1=(-b-sqrt(m))/2;
x2=(-b+sqrt(m))/2;
cout<<"x1="<<x1<<endl;
cout<<"x2="<<x2<<endl; }
else
cout<<"無解"<<endl;
}