public static void Main()
Console.WriteLine("a= ");
double a = double.Parse(Console.ReadLine());
Console.WriteLine("b= ");
double b = double.Parse(Console.ReadLine());
Console.WriteLine("c= ");
double c = double.Parse(Console.ReadLine());
x1=(-b+Math.Sqrt(d))/(2*a);
x2=(-b-Math.Sqrt(d))/(2*a);
Console.WriteLine("x1= "+x1);
Console.WriteLine("x2= "+x2);
Console.WriteLine("x= "+x);
Console.WriteLine("няма решение");