高分求高手用VB编程一个简单的计算器,有可选要求的```答:unit Unit1;interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,Dialogs, DB, ADODB, StdCtrls, Buttons, ComCtrls;type TForm1 = class(TForm)ADOQuery1: TADOQuery;GroupBox1: TGroupBox;Edit1: TEdit;BitBtn1: TBitBtn;procedure BitBtn1Click(Sender: T...