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Emaide1
@Emaide1
May 2019
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Bonsoir,j'ai besoin d'aide pour l'exercice 4 de niveau 4e, je met pour cela 8 points, merci d'avance !
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Christine17
L=c+9
l=c-6
aire carré c²
aire rectangle (c+9)(c-6)=c²-6c+9c-54=c²+3c-54
c²=c²+3c-54
0=3c-54
3c=54
c=54/3=18
la longueur du côté du carré est de 18
0 votes
Thanks 1
nadiab
Bonjour,
aire carré initial = x²
aire du rectangle =( x+9)( x -6)
Aire du rectangle= x² +9x-6x -54
Aire du rectangle= x² +3 x - 54
x²= x² + 3 x - 54
x²-x² -3 x =-54
-3x = -54
x =18
1 votes
Thanks 1
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Bonsoir, comment se nomme la "famille" des ordinateurs/tablettes/smartphones etc ?
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l=c-6
aire carré c²
aire rectangle (c+9)(c-6)=c²-6c+9c-54=c²+3c-54
c²=c²+3c-54
0=3c-54
3c=54
c=54/3=18
la longueur du côté du carré est de 18
aire carré initial = x²
aire du rectangle =( x+9)( x -6)
Aire du rectangle= x² +9x-6x -54
Aire du rectangle= x² +3 x - 54
x²= x² + 3 x - 54
x²-x² -3 x =-54
-3x = -54
x =18