拖三个textbox，一个button
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在窗体上双击button1，在自动生成的button1的Click事件中：
textbox2.text=val(textbox1.text)^2
textbox3.text=val(textbox1.text)^3
以下是平方镜在vb.net中的程序，需要一个 listbox和command
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim xx As Long, j As String, i As String
xx = InputBox("请输入最大范围数", 100000)
For m = 10 To xx
i = m
j = StrReverse(i)
If i = j Then GoTo 10
If Int(i) ^ 2 = StrReverse(Int(j) ^ 2) Then
ListBox1.Items.Add(i " " j " " i ^ 2 " " j ^ 2)
End If
10:
Next
End Sub
End Class
如果想在vb6中运行 就把 ListBox1.Items.Add 改成 list1.additem
Public Function panduan(ByVal n As Integer) As Boolean
Dim res As Boolean = False
Dim a, b, c, d, temp1, temp2 As Integer
a = n \ 1000
b = (n \ 100) Mod 10
c = (n \ 10) Mod 10
d = n Mod 10
temp1 = Sqrt(n)
temp2 = Sqrt(a + b + c + d)
If temp1 * temp1 = n And temp2 * temp2 = (a + b + c + d) Then
res = True
End If
Return res
End Function
Private Sub Button7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button7.Click
Dim str As String = "", temp As Integer = 0, sum As Integer = 0, x As Integer
For i = 1000 To 9999 Step 1
If panduan(i) Then
temp = i
Exit For
End If
Next
TextBox6.Text = temp
End Sub
多线程一般是不推荐用的，因为线程之间如果有共享资源的话会引起竞争，需要加锁处理；而且线程间没有时序关系，所以你在调试中可能会出现异步处理结束顺序与开始处理顺序不一致的情况（我在调试中已经发现该问题）。
针对你提出的这个问题，采用了多线程处理，利用的是BackgroundWorker也就是异步处理控件进行了处理。
代码已经经过调试通过。欢迎交流，如有问题，留下QQ或其他联系方式。
代码如下，并附程序截图。
‘---------------------------------------------------
Imports System.ComponentModel '导入异步控件命名空间
Public Class Form1
Private howmany As Integer = 10
Private AnalysisNumber(0 To howmany - 1) As BackgroundWorker
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
ListBox1.Items.Clear()
creatNewBackgroundWorker()
addHandle()
startWork()
End Sub
Private Sub creatNewBackgroundWorker()
For i As Integer = 0 To AnalysisNumber.Length - 1
AnalysisNumber(i) = New BackgroundWorker
Next
End Sub
Private Sub addHandle()
For i As Integer = 0 To AnalysisNumber.Length - 1
AddHandler AnalysisNumber(i).DoWork, AddressOf AnalysisNumber_DoWork
AddHandler AnalysisNumber(i).RunWorkerCompleted, AddressOf AnalysisNumber_RunWorkerCompleted
Next
End Sub
Private Sub startWork()
For i As Integer = 0 To 9
Dim temp(0 To 9) As Integer
For j As Integer = 1 To 10
temp(j - 1) = 10 * i + j
Next
AnalysisNumber(i).RunWorkerAsync(temp)
Next
End Sub
Private Sub AnalysisNumber_DoWork(ByVal sender As Object, ByVal e As System.ComponentModel.DoWorkEventArgs)
Dim data As Integer()
data = CType(e.Argument, Integer())
Dim temp As Integer
For i As Integer = 0 To data.Length - 1
temp = data(i)
data(i) = temp * temp
Next
e.Result = data
End Sub
Private Sub AnalysisNumber_RunWorkerCompleted(ByVal sender As Object, ByVal e As System.ComponentModel.RunWorkerCompletedEventArgs)
Dim data As Integer()
data = CType(e.Result, Integer())
For i As Integer = 0 To data.Length - 1
ListBox1.Items.Add(data(i))
Next
End Sub
End Class
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