| 12) | Place + ou – entre les nombres |
|
10
|
–
|
25
|
+
|
3
|
=
|
– 12
|
|
37
|
+
|
25
|
–
|
12
|
=
|
50
|
|
– 10
|
+
|
30
|
–
|
60
|
=
|
– 40
|
|
– 5
|
+
|
10
|
–
|
20
|
=
|
– 15
|