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lola946
@lola946
April 2022
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Bonjour c'est important
Factorise puis réduis chaque expressions
A=(x - 1)^2 + (x - 1)(2x +3)
B= (2x +3)(x - 5) - (x - 5^2
C= (2t- 7) - (5t +1)(2t - 7)
D=(3 - 2x)^2 - 4
E=121 - (x - 7)^2
F= (7x + 8)^2 - (9 - 5x)^2
merci d'avance.
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ayuda
bjrA=(x - 1)² + (x - 1)(2x +3)A = (x-1) (x-1) + (x-1) (2x+3)facteur commun en grasA = (x-1) (x-1) + (x-1) (2x+3)on aura doncA = (x-1) facteur de (.. on recopie ce qui n'est pas en gras..)A = (x-1) [(x-1) + (2x+3)]et on réduitA = (x-1) (x-1+2x+3)A = (x-1) (3x+2)B= (2x +3)(x - 5) - (x - 5)²même raisonnement avec (x-5) facteur deC= (2t- 7) - (5t +1)(2t - 7) = 1 * (2t - 7) - (5t + 1) (2t - 7)toujours pareilpour D, E et F - pensez à a² - b² = (a+b) (a-b)soitD=(3 - 2x)² - 2²=> D = [(3 - 2x) + 2] [(3-2x) - 2] = (-2x + 5) (-2x+1)E=121 - (x - 7)² = 11² - (x-7)²idemF= (7x + 8)^2 - (9 - 5x)^2tjrs pareil a² - b² = (a+b) (a-b)avec a = 7x+8et b = 9-5x
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tagadafraise
Pouvez vous m’aider à mon devoir d’anglais svp
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Bonsoir c'est important Factoriser les expressions suivantes.. A= 4r+4t B=7z+9z C=3y^2+2y D=4x( x + 2) +3( x +2) E= -3y (y + 6) + 7 (y +6) F= (x - 1)(5x +4) + (3 +x)(x - 1) Merci d'avance.
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