Réponse :
bonsoir
A = 3(x + 6)-2 = 3 x + 18 - 2 = 3 x + 16
B = 4 + 3(2y - 2) = 4 + 6 y - 6 = 6 y - 2
C = 3,5(2 - x) + 8,2 = 7 - 3.5 x + 8.2 = - 3.5 x + 15.2
D = 9(x-6) + 2x = 9 x - 54 + 2 x = 11 x - 54
E = x (x + 6) -r = x² + 6 x - r
F = x(y-2) + xy = xy - 2 x + xy = 2 xy - 2 x
G = 2x(x + 1) - 4x2 = 2 x² + 2 x - 4 x² = - 2 x² + 2 x
H = 3x(x + 4) - 6x2 = 3 x² + 12 x - 6 x² = - 3 x² + 12 x
I = -2(x - 5) -3(7 - 4x) = - 2 x + 10 - 21 + 12 x = 10 x - 11
J = 8 + 2y - 5(2y - 6) + 4 = 8 + 2 y - 10 y + 30 + 4 = - 8 y + 42
Explications étape par étape :
