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Jojo55555
@Jojo55555
May 2019
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Calcul littéral:
Bonjour pourriez vous m'aider svp je suis coincé et c'est un DM type brevet c'est vraiment important..Merci d'avance:
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maudmarine
Verified answer
Bonjour,
1)
Rappel formule aire rectangle
:
A = Longueur x Largeur
Donc :
A₁ = (2x - 3) (8x - 4)
A₁ = 16x² - 8x - 24x + 12
A₁ = 16x² - 32x + 12
2)
A₂ = (8x - 4)²
A₂ = 64x² - 64x + 16
3)
A = [(2x - 3) + (8x - 4)] (8x - 4)
A = (2x - 3 + 8x - 4) (8x - 4)
A = (10x - 7) (8x - 4)
A = 80x² - 40x - 56x + 28
A = 80x² - 96x + 28
4)
Pour x = 6 cm
A = 80x² - 96x + 28
A = 80 * 6² - 96 * 6 + 28
A = 80 * 36 - 576 + 28
A = 2880 - 548
A = 2332
1 votes
Thanks 1
jojo55555
Merci beaucoup !
maudmarine
De rien
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Verified answer
Bonjour,1) Rappel formule aire rectangle :
A = Longueur x Largeur
Donc :
A₁ = (2x - 3) (8x - 4)
A₁ = 16x² - 8x - 24x + 12
A₁ = 16x² - 32x + 12
2)
A₂ = (8x - 4)²
A₂ = 64x² - 64x + 16
3)
A = [(2x - 3) + (8x - 4)] (8x - 4)
A = (2x - 3 + 8x - 4) (8x - 4)
A = (10x - 7) (8x - 4)
A = 80x² - 40x - 56x + 28
A = 80x² - 96x + 28
4) Pour x = 6 cm
A = 80x² - 96x + 28
A = 80 * 6² - 96 * 6 + 28
A = 80 * 36 - 576 + 28
A = 2880 - 548
A = 2332