Exercice 4: Effectue les sommes suivantes :
- 1+2-4+ 5 = ......
5-3-9 + 5 =.
2-5-1+7=.
-4-1+7-3 = .
- 1+2-4+ 5 = ......
5-3-9 + 5 =.
2-5-1+7=.
-4-1+7-3 = .
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Réponse:
- 1 + 2 - 4 + 5
1 - 4 + 5
- 3 + 5
2
5 - 3 - 9 + 5
2 - 9 + 5
- 7 + 5
- 2
2 - 5 - 1 + 7
- 3 - 1 + 7
- 4 + 7
3
- 4 - 1 + 7 - 3
- 5 + 7 - 3
2 - 3
- 1