Giai Phuong trinh bac 2 Tony Quang

import java.util.Scanner; public class test { public static void main(String[] args) { int a,b,c,delta; //float x1,x2; System.out.println("Nhap a, b, c: "); Scanner input = new Scanner(System.in); a = input.nextInt(); b = input.nextInt(); c = input.nextInt(); delta = b*b - (4*a*c); if (a==0) { if (b==0) { if (c==0) System.out.println("Phuong trinh co vo so nghiem!"); else System.out.println("Phuong trinh vo nghiem!"); } else System.out.println("Phuong trinh co nghiem :"+((float)-c/b)); } else if (a!=0) { if (delta<0) System.out.println("Phuong trinh vo nghiem!"); else if (delta==0) System.out.println("Phuong trinh co nghiem kep: "+((float)-b/(2*a))); else { System.out.println("Phuong trinh co nghiem x1= "+(((float)-b-Math.sqrt(delta))/(2*a))); System.out.println("Phuong trinh co nghiem x2= "+(((float)-b+Math.sqrt(delta))/(2*a))); } } } }