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Soniad62100
@Soniad62100
May 2019
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Bonjour merci d'avance SVP aider moi
On considère l'expression suivante : C= (x+9) (x-1) - x aux carré
1) développé et réduis C
2) Comment peux-tu calculer facilement sans calculatrice le résultat de 2009 x 1999 - 2000 au carré
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Verified answer
Bonjour,
1) (x+9)(x-1)-x² =
x²-x+9x-9-x² = 8x-9
2) 2009-1999 - 2000² =
(2000+9)(2000-1)-2000² =(x+9)(x-1)-x² = 8x-9
avec x = 2000 = 8*2000-9 = 16000-9 = 15991
1 votes
Thanks 1
soniad62100
merci ;)
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Verified answer
Bonjour,1) (x+9)(x-1)-x² =
x²-x+9x-9-x² = 8x-9
2) 2009-1999 - 2000² =
(2000+9)(2000-1)-2000² =(x+9)(x-1)-x² = 8x-9
avec x = 2000 = 8*2000-9 = 16000-9 = 15991