#include <iostream>
#include <cmath>
using namespace std;
int main(){
double a,b,c;
cin>>a>>b>>c;
if(bb==4ac){
cout << "x1=x2=";
double x=(-b+sqrt((bb-4ac)))/(2a);
printf("%.5lf",x);
}else if(bb>4ac){
double x1= (-b+sqrt(bb-4ac))/(2a);
double x2= (-b-sqrt(bb-4ac))/(2a);
printf("x1=%.5lf;x2=%.5lf",x1,x2);
}else if(bb<4ac){
double y=-1b/(2a);
if(y==0) y=0;
double u=sqrt((4ac-bb))/(2*a);
printf("x1=%.5lf+%.5lfi;x2=%.5lf-%.5lfi",y,u,y,u);//写lf好习惯
}
return 0;//不写return0好习惯
}
