bsr
+7 - 3 = + 4
8 +3 = 11 ok
-5 - 4 = - 9
et
-5 + 4 = - 1 ok
première ligne
- (+3) = - 3
ligne 3
- (+4) = - 4
bonsoir
7 - 3 = 4
8 + 3 = 11
- 5 - 4 = - 9
- 5 + 4 = - 1
