bonjour
2
2 + 3 = 5
5 x 4 = 20
20 - 12 = 8
8
- 5
- 5 + 3 = - 2
- 2 x 4 = - 8
- 8 - 12 = - 20
= - 20
2/3
2/3 + 3 = 11/3
11/3 x 4 = 44/3
44/3 - 12 = 8/3
= 8 /3
x
x + 3
4 ( x + 3 ) = 4 x + 12
4 x + 12 - 12
= 4 x
on retrouve la quadruple du nombre de départ