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Sagot :

1. Aire AEFG = 3x
Aire ABCD = 70
Aire EBGDC = aire ABCD - aire EFGA
= 70 - 3x
2. Il faut résoudre aireEFGA = 3/7 x aireEBGD
3x = 3/7 (70-3x)
3x = (210 - 9x) / 7
30x = 210
X = 210/30 = 7

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