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Sagot :

Réponse :

a) tarif A --> 8 x 1.5 + 21 = 33

   tarif B --> 8 x 5 = 40

b) tarif A --> ₓ x 1.5 + 21 = 1.5 ₓ + 21

   tarif B --> 8 x ₓ = 8ₓ

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