Bonjour,
Exercice 1 :
A = 7 (a + 7)
A = 7a + 49
B = 8 (b - 3)
B = 8b - 24
C = (a + 2b - 8) 4
C = 4a + 8b - 32
D = 3y (2y + 5)
D = 6y² + 15y
E = 2 (5x - 1)
E = 10x - 2
F = -3a (6 - 5a)
F = -18a + 15a²
F = 15a² - 18a
Exercice 2 :
a) 3x * 5
= 15x
b) 3 + 5x
= 5x + 3
c) 3x - 5x
= -2x
d) 3x + 5x²
= 5x² + 3x
e) 3x * 5x
= 15x²
f) 3 + x + 5 + x²
= x² + x + 3 + 5
= x² + x + 8
g) -3x + 5x
= 2x
h) 3x² + 5x²
= 8x²
Bonne fin de journee
