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Sagot :

Bonsoir
soit x la L
on a :
Périmètre = x + x/2 + 3/4x
P = 4x +2x +3x = 9x
si L = 7
P = 7 +7/2 + 3/4x7
 p = 7 + 7/2 + 21/4
P = 28 +14 +21 = 63 cm

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