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Option Explicit
Private Sub Command1_Click()
Dim i As Long, j As Long, k As Long
Dim s As Long, a As Long
j = InputBox("请è¾å
¥ä¸ä¸ªæ£æ´æ°ï¼")
If j < 1 Then
MsgBox "åºéï¼"
Exit Sub
End If
For i = 1 To j
a = 1
For k = 1 To i
a = a * k
Next
s = s + a
Next
MsgBox "1!+2!+3!+...+N!=" & s
End Sub
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