lz的要求只能用vba解决,在sheet1的代码区域输入如下:
Private Sub Worksheet_Change(ByVal Target As Range)
If Target.Row = 1 And Target.Column <= 2 Then
If Target.Column = 1 Then
Cells(1, 2) = 3 - Target
Else
Cells(1, 1) = 3 - Target
End If
End If
End Sub
那你设a1=a3-a2
a2=a3-a1
2楼思路不错 可惜是个循环引用 呵呵
A2输入 =3-A1