Worksheets("MAT").Range("I4:U4").Copy
With Worksheets("synthèse")
dlig = .Range("A" & Rows.Count).End(xlUp).Row + 1
.Range("A" & dlig).PasteSpecial Paste:=xlPasteValues, Operation:=xlNone, SkipBlanks _
:=False, Transpose:=False
Application.CutCopyMode = False
End With