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Dreamus
@Dreamus
April 2019
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Développer et réduire :
E= (3x - 2) (2x - 1/4)
F= (1 + 2x)( 1 - 4.5x) + 2( 2x - 1)²
1/4 est une fraction et non une division ^^
Merci de votre aide !
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maudmarine
Verified answer
Bonjour,
E= (3x - 2) (2x - 1/4)
E = 6x² - 3/4x - 4x + 2/4
E = 6x² - 0,75x - 4x + 0,5
E = 6x² - 4,75x + 0,5
F= (1 + 2x)( 1 - 4.5x) + 2( 2x - 1)²
F = 1 - 4,5x + 2x - 9x + 2 (4x² - 4x + 1)
F = 1 - 4,5x + 2x - 9x + 8x² - 8x + 2
F = 8x² - 4,5x - 8x - 9x + 2x + 1 + 2
F = 8x² - 19,5x + 3
1 votes
Thanks 1
Dreamus
merci
maudmarine
De rien
nonotata
Bonjour
E= (3x - 2) (2x - 1/4)
e = 6x²-3/4x-4x+2/4
e =6x²-3/4x-16/4x +1/2
e =6x²-19/4x+1/2
F= (1 + 2x)( 1 - 4.5x) + 2( 2x - 1)²
f = 1-4.5x+2x-9x²+2(4x²-4x+1)
f = -9x²-2.5x+1+8x²-8x+2
f = -x²-10.5x+3
1 votes
Thanks 0
Dreamus
Tape l'expression que j'ai donné et puis ton résultat en remplaçant x par 2
Dreamus
Ça ne donne pas le meme résultat
Dreamus
(3*2-2)(2*2-1/4) = 15 alors que 6*2²-19/4+1/2 = 19,75
Dreamus
Donc la E est fausse ? Ou j'ai mal tapé à la calculatrice ?
Dreamus
Chuis bête !
Dreamus
Mrc
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Verified answer
Bonjour,E= (3x - 2) (2x - 1/4)
E = 6x² - 3/4x - 4x + 2/4
E = 6x² - 0,75x - 4x + 0,5
E = 6x² - 4,75x + 0,5
F= (1 + 2x)( 1 - 4.5x) + 2( 2x - 1)²
F = 1 - 4,5x + 2x - 9x + 2 (4x² - 4x + 1)
F = 1 - 4,5x + 2x - 9x + 8x² - 8x + 2
F = 8x² - 4,5x - 8x - 9x + 2x + 1 + 2
F = 8x² - 19,5x + 3
E= (3x - 2) (2x - 1/4)
e = 6x²-3/4x-4x+2/4
e =6x²-3/4x-16/4x +1/2
e =6x²-19/4x+1/2
F= (1 + 2x)( 1 - 4.5x) + 2( 2x - 1)²
f = 1-4.5x+2x-9x²+2(4x²-4x+1)
f = -9x²-2.5x+1+8x²-8x+2
f = -x²-10.5x+3