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QueenKiwi
@QueenKiwi
April 2019
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Si qql pourrait maider svppp.
voir photo
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Rachimi
E = (3x -2)² + (3x -2)(x+3) = (3x-2)(3x-2) + (3x-2)(x+3) = 3x fois 3x + 3x fois -2 -2fois 3x -2 fois -2 + 3x fois x + 3x fois 3 -2 fois x -2 fois 3
= 9x² -6x - 6x + 2 + 3x²
= 9x² + 3x² -6x - 6x + 2
= 12x² -12x + 2
Pour x = -1 et x pour "fois"
E = (3 x (-1) - 2)² +
(3 x (-1) - 2)(-1+3)
= (-3 - 2) + (-3 - 2) x 2
= -5 - 5 x2
= -5 - 10 =
- 15
0 votes
Thanks 1
QueenKiwi
merciiiiii!!!
QueenKiwi
pour (3x-2)au carré, je peux pas utiliser l'identité remarquable?
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Est ce que qql pourrait me simplifier la fraction : -133/336 le plus possible ?
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= 9x² -6x - 6x + 2 + 3x²
= 9x² + 3x² -6x - 6x + 2
= 12x² -12x + 2
Pour x = -1 et x pour "fois"
E = (3 x (-1) - 2)² + (3 x (-1) - 2)(-1+3)
= (-3 - 2) + (-3 - 2) x 2
= -5 - 5 x2
= -5 - 10 = - 15