#include <iostream>
#include<math.h>
using namespace std;
int main(){
	int a,b,c;
	cout<< " nhap so a =";cin>>a;
	cout<<" nhap so b = "; cin>>b;
	cout<<"nhap so c = ";cin>>c;
	if (a==0){
		if(b==0)
		{if (c==0)
		cout<< "phuong trinh vo nghiem";
		else {


		cout << "phuong trinh vo so nghiem";}
		 else


		cout << "phuong trinh co 1 nghiem ="<<float(-c/b);}
		}
		 else{
		cout << " phuong trinh co nghiem x1 =  "<<float((-b+sqrt(b^2-4*a*c))/2*a)<<endl;
		cout << " phuong trinh co nghiem x2 = "<<float((-b-sqrt(b^2-4*a*c))/2*a);}

return(0);
	}