^_^,不好意思,帮看看
Private Sub Command26_Click() '后退键
Call qingshuru
If Text1.Text <> "" Then
Text1.Text = Mid(Text1.Text, 1, Len(Text1.Text) - 1)
End If
Text1.SetFocus '焦点停在输入框
Text1.SelStart = Len(Text1.Text) '焦点在文本最后
End Sub
’================================================================
Private Sub Command25_Click() '等于号按钮
If Text1.Text = "请输入算式" Then
    Text1.Text = ""
ElseIf Text1.Text = "" Then
    Text2.Text = ""
Else
    t = Text1.Text
    Call hunhe
ling:
   If p = 1 Then
            Text2.Text = "错误,除数不能为零。"
        Else
            If h < 1 And h > -1 Then
                Text2.Text = "=" & Replace(h, ".", "0.")
            Else
                Text2.Text = "=" & h
            End If
        End If
End If
Text1.SetFocus '焦点停在输入框
Text1.SelStart = Len(Text1.Text) '焦点在文本最后
End Sub