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Sagot :

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a) tu as 12 carreaux

la partie bleue = 1/3 soit 4 carreaux car  12/3 = 4carreaux

la partie violette = 7/12 soit 7 carreaux car 12*7/12 = 7 carreaux

b)

1 : 6 carreaux au total

1/2 + 2/6 = 5/6

2 : 15 carreaux au total

10/15 + 1/15 = 11/15

3 : 16 carreaux

4/16 + 7/16=11/16

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