Sub Macro1()
Application.ScreenUpdating = False
Sheets("Visualisation et impression").Activate
Dim i As Integer
For i = 1 To 100
If Cells(i, 1) = "A" Then
Range("A" & i, "K" & i + 20).Select
Selection.EntireRow.Delete
Range("A11").Select
End If
Next i
Application.ScreenUpdating = True
End Sub