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11-09-2022
Mathematics

contestada

EXERCICES
CALCUL DES NO
Exercice 1: Les phrases suivantes sont-elles vraies
pour tout nombre relatif a? Justifie tes réponses.
a. Le produit (-4) × a est négatif.
X
b.
a² est positif.
c. Le produit de a par son opposé est négatif.
d. Le double de a est positif

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