Giai_PTB1.java

public class Giai_PTB1 {
	public float PTB1(int a, int b)
	{
		
		if ( a==0.0 && b==0.0 ) throw new IllegalArgumentException("Co vo so nghiem");
		else
			if ( a==0.0 && b!=0.0) throw new IllegalArgumentException("Khong co nghiem");
		return (float)-b/(float) a;
		
	}
}