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Sagot :

Réponse:

21: 9 + 12 - 4 = 17

22: 5 + 12 - 6 = 11

23: 63 - 13 = 50

24: 142 + 2 = 144

25: 6 + 16 - 10 = 10

26: 24 + 2 = 26

27: 900 + 100 = 1000

28: 11,5 - 5 = 5,5

29: 30 + 12 = 42

30: 18 + 6 = 24

31: 7 x 7 = 49

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