bonsoir,
1 ) hauteur du store = 2.5 - x
largeur = 1.4
aire du store = 1.4 ( 2.5 - x ) = 3.5 - 1.4 x m²
2 ) graphique
3 ) 2.5 x 1.4 = 3.5
aire de la vitre = 3.5 m²
aire rouge = 2.8 m²
2.5 x = 2.8
x = 1.12
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bonsoir,
1 ) hauteur du store = 2.5 - x
largeur = 1.4
aire du store = 1.4 ( 2.5 - x ) = 3.5 - 1.4 x m²
2 ) graphique
3 ) 2.5 x 1.4 = 3.5
aire de la vitre = 3.5 m²
aire rouge = 2.8 m²
2.5 x = 2.8
x = 1.12