验证一个自然数 n 的立方等于 n 个连续的奇数之和。其中最大的奇数 P=n*(n+1)-1 。例如, 7^3=343=55+53+51+49+47+45+43 ,最大奇数等于 7 × (7+1)-1=55 。请完善下列程序。 Private Sub Command1_Click() Dim n As Integer Dim num As Long, P As Integer, X As String If Text1.Text<>"" And IsNumeric(Text1.Text) Then n=___________________________ num=n*n*n text2.Text=__________________________ P = n*(n +1)-1 X = x & Str(p) & "+" For I=l To n-3 ______________________ X=x & Str(p) & "+" Next i P = P-2 X=____________________ Text3.Text=X Else Print MsgBox(" 数据错误 ! ", 48, "VB 试题 ") End If End Sub