Calculer avec 1º) Développer : A = 2(3x + 7) B = a(5 + b) C = 2(5x - 1) - D=3a(6 + 5a) E=3(x + 4) + 2(x+5) F = x(4 - x) + 5(x-7) G= 3x(x + 4) - (x2 + 3)

2°) Factoriser: H=6xx + 6x2 I = 5y - 10 J= 3x - 9 K= 4x2 + 3x L = (x + 3)(2x - 4) + (x + 3)(x + 5)


Je suis en grande difficulté
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