import java.util.Scanner;
import java.lang.Math;
class EquationRoot
{
    public static void main(String[] args)
    {
        Scanner scan = new Scanner(System.in);
        double a,b,c,disc,x1,x2,p,q;

        System.out.print("请输入系数a=");
        a = scan.nextDouble() ;

        System.out.print("请输入系数b=");
        b = scan.nextDouble() ;

        System.out.print("请输入系数c=");
        c = scan.nextDouble() ;

        disc=b*b-4*a*c;

        if ( Math.abs(disc) <= 1e-6 )
            System.out.println("x1=x2="+(-b/(2*a)));
        else
        {
            if(disc>1e-6)
            {
                x1=(-b+Math.sqrt(disc))/(2*a);
                x2=(-b-Math.sqrt(disc))/(2*a);
                System.out.printf("x1=%7.2f,x2=%7.2f\n", x1, x2);
            }
            else
            {
                p=-b/(2*a);
                q=Math.sqrt(Math.abs(disc))/(2*a);
                System.out.printf("x1=%7.2f + %7.2f i\n", p, q);
                System.out.printf("x2=%7.2f - %7.2f i\n", p, q);
            }
        }
    }
}