SI(NB.SI(A$2:A2;A2)>=2;SOMMEPROD((A$2:A2=A2)*(B$2:B2))-INDEX(B$2:B2;EQUIV(A2;A$2:A2;0));"")
=SI(NB.SI(A$2:A2;A2)=NB.SI(A$2:A$6;A2);SOMMEPROD((A$2:A2=A2)*(B$2:B2))-INDEX(B$2:B2;EQUIV(A2;A$2:A2;0));"")
SI(NB.SI(A$2:A2;A2)=NB.SI(A$2:A$6;A2);SOMME.SI(A$2:A2;A2;B$2:B2)-INDEX(B$2:B2;EQUIV(A2;A$2:A2;0));"")
SI(NB.SI(A2:A$6;A2)=1;SOMMEPROD((A$2:A2=A2)*(B$2:B2))-INDEX(B$2:B2;EQUIV(A2;A$2:A2;0));"")
SI(NB.SI(A2:A$6;A2)=1;SOMME.SI(A$2:A2;A2;B$2:B2)-INDEX(B$2:B2;EQUIV(A2;A$2:A2;0));"")