Bonjour
Exercice n°2: Sur le cahier, regrouper les expressions qui sont égales.
A = 8x +3 - (6. + 2)
A = 8x + 3 - 6 - 2
A = 8x - 5
B = (9x + 5) + (-2x + 3)
B = 9x + 5 - 2x + 3
B = 7x + 8
c = (409)-(2-7)
C = 409 - (- 5)
C = 409 + 5
C = 414
D: (
95) - 2x + 3
D = 95 - 6
D = 89
E = (4x - 9) - 2x +7
E = 4x - 9 - 2x + 7
E = 4x - 2x - 9 + 7
E = 2x - 2
H = 8x+3 - 6x-2
H = 2x + 1
Exercice n°3: Recopier les expressions sur le cahier. Supprimer les parenthèses puis ré
duire
E = (5x + 4) + (-3x - 2)
E = 5x + 4 - 3x - 2
E = 2x + 2
F:9,5+(-7x + 8,2)
F = 9,5 - 7x + 8,2
F = - 7x + 17,7
K:56 - (2x - 3)
K = 56 - 2x + 3
K = - 2x + 59
M = 4 + 6x - (-2x + 7)
M = 4 + 6x + 2x - 7
M = 8x - 3
L = 3x2 - (4x2-x + 5)
L = 3x² - 4x² + x - 5
L = - x² + x - 5
N=-5x - (-5x + <- 1)
N = - 5x + 5x .... incompréhensible
O: (6 + 8) - (4a + 2)
O = 14 - 4a - 2
O = - 4a + 12
P = (7-2) + (3b-5)
P = 5 + 3b - 5
P = 3b.
