Bonjour,
Développer et réduire chaque expression:
A = 5(x + 5) - 13
A = 5*x + 5*5 - 13
A = 5x + 25 - 13
A = 5x + 12
B = 3(x + 1) + x + 4
B = 3*x + 3*1 + x + 4
B = 3x + 3 + x + 4
B = 4x + 7
C = 2(x + 3,5) + 2x
C = 2*x + 2*3,5 + 2x
C = 2x + 7 + 2x
C = 4x + 7
D = 2(x + 4) + 2(x - 0,5)
D = 2*x + 2*4 + 2*x - 2*0,5
D = 2x + 8 + 2x - 1
D = 4x + 7
* = multiplication
Bonne journée.