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Sagot :

Réponse :

Explications étape par étape :

Bonsoir

A = - 12/7 + 5/14

A = -24/14 + 5/14

A = -19/24

B = 8/35 + 6/15

B = 8/35 + (3×2)/(3×5)

B = 8/35 + 2/5

B = 8/35 + 14/35

B = 22/35

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