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oufrai
@oufrai
January 2021
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bonsoir tout le monde j'ai besoin d'aider merci c urgent !!!
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grr12
Périmètre = 7 + 3 + (7+x) + (3+x) + x + x = 20 + 4x
Aire = (7+x) (3+x) - 21 = 21 + 10x + x carré - 21 = x carré + 10x
Si périmètre = 34 alors 4x + 20 = 34 et x = 14/4 = 7/2 = 3,5 m
Et aire : (7/2) carré + 10 fois 7/2
49/4 + 35 = (49 + 140)/4 = 189/4 m carrés
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Aire = (7+x) (3+x) - 21 = 21 + 10x + x carré - 21 = x carré + 10x
Si périmètre = 34 alors 4x + 20 = 34 et x = 14/4 = 7/2 = 3,5 m
Et aire : (7/2) carré + 10 fois 7/2
49/4 + 35 = (49 + 140)/4 = 189/4 m carrés