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Lalodu13
@Lalodu13
May 2019
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Bonjour, je sui en 1ere es et je n'arrive pas a faire cet exercice.
Voici l'énoncé :
Montrer que les expressions sont égales :
-un demi (x-2)carré + 8 et un demi (6-x) (x+2)
Merci d'avance
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swnn
-0,5*(x-2)² + 8 = -0,5*(x²-4x+4) + 8 = -0,5x²+2x-2+8 = -0,5x²+2x+6
0,5*(6-x)(x+2) = 0,5*(6x+12-x²-2x) = 0,5*(4x+12-x²)= -0,5x²+2x+6
les deux expressions sont donc égales
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0,5*(6-x)(x+2) = 0,5*(6x+12-x²-2x) = 0,5*(4x+12-x²)= -0,5x²+2x+6
les deux expressions sont donc égales