Exercice 1: Développer et réduire les expressions A, B et C:
A = (2x - 1)² + 5(7x + 4)

B = 7x (3x - 5) + (3x + 2)²

C = (6-x)²-(x + 7)(x-7)

aide :(mettre des ( autour de (x+7)(x-7) et développer)​
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