помогите с задачей номер 9

ApplicationEvents1

procedure TForm1.ApplicationEvents1Message(var Msg: tagMSG;
  var Handled: Boolean);
begin
  Button1.Enabled := ((Edit1.Text <> '') and (Edit2.Text <> ''))
end;

procedure TForm1.Timer1Timer(Sender: TObject);
begin
   Button1.Enabled := ((Edit1.Text <> '') and (Edit2.Text <> ''))
end;

unit Unit1;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;
 
type
  TForm1 = class(TForm)
    Button1: TButton;
    Label1: TLabel;
    Edit1: TEdit;
    Edit2: TEdit;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
 
var
  Form1: TForm1;
 
implementation
 
{$R *.dfm}
 
procedure TForm1.Button1Click(Sender: TObject);
var I,U,R:real;
begin
U:=strtofloat(Edit1.Text);
R:=strtofloat(Edit2.Text);
I:=U/R;
label1.caption:=floattostr(I) ;
end;
end.