Bonjour,
Sophie :
4
4 + 8 = 12
12×3 = 36
36 - 24 = 12
12 - 4 = 8
Vraie
Gabriel :
-3
-3 + 8 = 5
5×3 = 15
15 - 24 = -9
-9 -(-3) = -9 + 3 = -6
Faux
Martin
0
0 + 8 = 8
8×3 = 24
24 - 24 = 0
0 - 0 = 0
Faïza :
x
x + 8
3(x + 8)
3(x + 8) - 24
3(x + 8) - 24 - x
On développe :
3x + 24 - 24 -x = 2x
Donc vrai