bonsoir
programme A
- 2
- 2 x 3 = - 6
- 6 + 7 = 1
1 x 2 = 2
2
on obtient l'opposé du nombre de départ
B
3
3 x 5 = 15
15 - 4 = 11
11 x 2 = 22
B
x
5 x
5 x - 4
2 ( 5 x - 4 ) = 10 x - 8
10 x - 8
10 x - 8 = 0
10 x = 8
x = 8/10 = 4/5
il faut choisir 4/5
A
x
3 x
3 x + 7
2 ( 3 x + 7) = 6 x + 14
6 x + 14
6 x + 14 = - 2
6 x = - 2 - 14
6 x = - 16
x = - 16/6 = - 8/3
10 x - 8 = 6 x + 14
10 x - 6 x = 14 + 8
4 x = 22
x = 22/4 = 11 /2 = 5.5
A = B pour x = 5.5