Réponse :
EXERCICE 6
A = x + 3 + 5x - 8x = -2x + 3
B = 4,5y - 3 - 2,5y + 4 = 2y + 1
C = -x - 3x + 1/2 + x = - 3x + 1/2
D = 3 + 4x - 2y + 4 - 6x - y - 8 = -2x - 3y -1
EXERCICE 7
E = 4/5x + 8/5x = 12/5x
F = 9/13y - 8/13y = 1/13y
G = 2/5a + 3/10a + 3/20a = (2x4)/(5a x4) + (3x2)/(10a x2) + 3/20a = 8/20a + 6/20a + 3/20a = 17/20a
H = -3/2x + 5/3y - 1/3x + 5/6y + 1/2 = (-3X3)/(2x X3) + (5 X 2)/(3y X 2) - (1 X 2)/3x X 2) + 5/6y + (1 X 3)/(2 X 3) = -9/6x + 10/6y - 2/6x + 5/6y + 3/6 = -11/6x + 15/6y + 3/6
Explications étape par étape
