执行下面程序,单击命令按钮Command1后,显示在窗体上最后一行的内容_____。 Option Explicit Dim N As Integer Private Sub Command1_Click() Dim I As Integer, J As Integer For I = 3 To 1 Step -2 N = Fun(I, N) Print N Next I End Sub Private Function Fun(A As Integer, B As Integer) As Integer Static X As Integer Dim Sum As Integer, I As Integer X = X + N For I = 1 To A B = B + X + I N = N - I \ 2 Sum = Sum + B Next I A = A + 1 Fun = Sum + A End Function