Bonjour, pouvez vous m'aider svp. Exercice n°2: Supprimer les parenthèses, puis réduire chaque expression
A = 50 - (x + 20)
B = -(10 + x) + (x + 5)
C = (x2 - 4x) - (5x2 + 2x - 1)​
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