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Gugo671
@Gugo671
May 2019
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Salut! Qui pourrait m’aider à faire mon exercice 2 ? Merci d’avance à celui où celle qui m’aide.
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B = (7x-8)(5x+4)-(7x-8)
B = 35x² + 28x - 40x - 32 - 7x + 8
B = 35x² - 19x - 24
B = (7x-8)(5x+4)-(7x-8)
B = (7x-8)(5x+4-1)
B = (7x-8)(5x+3)
Pour x = -1/2
B = 35 × (-1/2)² - 19 × (-1/2) - 24
B = 35 × 1/4 + 19 × 1/2 - 24
B = 35/4 + 38/4 - 96/4
B = - 23/4
Nombre rationnel car peut s'exprimer en fraction et nombre décimal car nombre non entier.
1 votes
Thanks 2
Gugo671
Merci et j’ai un exercice aussi de ce style là
Gugo671
sa te dérangerait de le faire ?
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Verified answer
B = (7x-8)(5x+4)-(7x-8)B = 35x² + 28x - 40x - 32 - 7x + 8
B = 35x² - 19x - 24
B = (7x-8)(5x+4)-(7x-8)
B = (7x-8)(5x+4-1)
B = (7x-8)(5x+3)
Pour x = -1/2
B = 35 × (-1/2)² - 19 × (-1/2) - 24
B = 35 × 1/4 + 19 × 1/2 - 24
B = 35/4 + 38/4 - 96/4
B = - 23/4
Nombre rationnel car peut s'exprimer en fraction et nombre décimal car nombre non entier.