Répondre :
(Y)*=(2-racine6)*
= 4-4racine6 +6
(X)* =(racine2+2racine3)*
= 2+2racine6+6
X*+Y*=8+2racine6+10-4racine6
=18-2racine6
= ...
= 4-4racine6 +6
(X)* =(racine2+2racine3)*
= 2+2racine6+6
X*+Y*=8+2racine6+10-4racine6
=18-2racine6
= ...