#include <iostream>
#include <cmath>
using namespace std;
int main()
{
	int a,b,c;
	float delta;
	cout<<"nhap vao a,b,c"<<endl;
	cin >> a;
	cin >> b;
	cin >> c;
	delta=b*b-4*a*c;
	if (a==0)
	{
		if (b!=0)
		{	cout << "nghiem cua phuong trinh: "<< -float(c)/float(b);
		}
		else
		{
			if(c!=0)
			{
				cout<<"phuong trinh vo nghiem";
			}
			else
			{
				cout<<"phuong trinh vo so nghiem";
			}
		}
	}
	else
	{
		if(delta<0)
		{
			cout<<"phuong trinh vo nghiem";
		}
		else
		{
			if(delta==0)
			{
				cout<<"phuong trinh co 1 nghiem kep x1 = x2 = "<< -float(b)/(2*float(a));
			}
			else
			{
				cout<<"nghiem x1 = "<< (-float(b)+ sqrt(delta))/(2*float(a))<<endl;
				cout<<"nghiem x2 = "<< (-float(b)- sqrt(delta))/(2*float(a));
			}
		}
	}
	return 0;
}