Aide moiiii svppp je dois rendre demain !!
2.
(a) Soit a E R\Q et r E Q, montrer que: (a+r) E R\Q
(On pourra raisonner par l'absurde)
(b) Soit a E R\Q et r E Q, montrer que: ar E R\Q
(On pourra raisonner par l'absurde)
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