Bonsoir,
La politesse est à mettre aux prochaines questions.
Développer :
L = 3(2x+5)
L = 3×2x+3×5
L = 6x+3×5
L = 6x+15
M = 12(3-5x)
M = 12×3-12×5x
M = 36-12×5x
M = 36-60x
N = 2x(x-9)
N = 2x×x-2x×9
N = 2x²-2x×9
N = 2x²-18x
Bonne soirée.
