bonjour
longueur = x
largeur = x/2
2 ( x + x/2 ) = 120
2 x + 2 x /2 = 120
2 x + x = 120
3 x = 120
x = 40
longueur = 40 et largeur = 20
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bonjour
longueur = x
largeur = x/2
2 ( x + x/2 ) = 120
2 x + 2 x /2 = 120
2 x + x = 120
3 x = 120
x = 40
longueur = 40 et largeur = 20