Bonjour,j'ai deux exercices de maths: Exercice 3:
Résoudre les équations suivantes:                                                                                                                            a)2(3x-8)= -5x-3                                 b)3(x-11)-12=2+(x+8)

Exercice 6:
Tracer un angle AOB tel que le cosinus de cet angle soit égal à 0,9.
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