Salut, j'ai besoin d'aide pour un devoir de Maths, merci d'avance pour les réponses.
Développer et réduire les expressions suivantes.
A= 5(a+2) - (6a-7)

B= -b (3b+7) + (5-b) * b

C= -c (4+3c) - (9-2c+6c²)

D= -5d + 5d(d-2) -6(7-3d)

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