using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

namespace bai01

{

public partial class Form1 : Form

{

Single a=0, b=0, ketqua=0;

string pheptoan;

public Form1()

{InitializeComponent();}