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Rosierodwell
@Rosierodwell
April 2019
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J'ai vraiment besoin d'aide c'est pour demain merci.
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winner123
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Bonjour
Exercice I
1) ( 3 x -1)² = 9 x² - 6 x +1
2) (2 x +5)² = 4 x² + 20 x +25
3) ( 3 x -2) ( 3 x+2) = 9 x² -4
4) (2 x -1 ) ( -x + 4) = - 2 x² + 8 x + x - 4 = - 2 x² + 9 x -4
5) ( - x -2) ( 2 x +7) = - 2 x² - 7 x - 4 x - 14 = - 2 x² - 11 x -14
6) ( x /2 - 1/3)² = x²/4 - 2 x/6 + 1/9 = 9 x²/36 - 12 x /36 + 4/36
= 9 x² - 12 x +4
exercice 2
1) ( 2 x - 1)²
2) (3 x + 2)²
3) (3 x -4)(3 x +4)
4) ( 3 x - 1 + 2 x +1) ( 3 x -1 - 2x - 1) = ( 5 x) ( x - 2)
5) ( x -2) ( 2 x +5 ) + 4 ( x -1)
= ( x - 2) ( 2 x + 5 + 4 x - 4)
= ( x -2) ( 6 x + 1)
6 ) ( 2 x -5)(2 x -5 + x + 7) = ( 2 x -5) ( 3 x + 2)
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rosierodwell
June 2021 | 0 Respostas
Besoin d'aide pour la question 4 a et b et la 5 merci.
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Rosierodwell
April 2019 | 0 Respostas
Besoin d'aide pour cette exercice.
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Rosierodwell
April 2019 | 0 Respostas
Vraiment bzsoin de votre aide pour ces deux exo.
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Lista de comentários
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BonjourExercice I
1) ( 3 x -1)² = 9 x² - 6 x +1
2) (2 x +5)² = 4 x² + 20 x +25
3) ( 3 x -2) ( 3 x+2) = 9 x² -4
4) (2 x -1 ) ( -x + 4) = - 2 x² + 8 x + x - 4 = - 2 x² + 9 x -4
5) ( - x -2) ( 2 x +7) = - 2 x² - 7 x - 4 x - 14 = - 2 x² - 11 x -14
6) ( x /2 - 1/3)² = x²/4 - 2 x/6 + 1/9 = 9 x²/36 - 12 x /36 + 4/36
= 9 x² - 12 x +4
exercice 2
1) ( 2 x - 1)²
2) (3 x + 2)²
3) (3 x -4)(3 x +4)
4) ( 3 x - 1 + 2 x +1) ( 3 x -1 - 2x - 1) = ( 5 x) ( x - 2)
5) ( x -2) ( 2 x +5 ) + 4 ( x -1)
= ( x - 2) ( 2 x + 5 + 4 x - 4)
= ( x -2) ( 6 x + 1)
6 ) ( 2 x -5)(2 x -5 + x + 7) = ( 2 x -5) ( 3 x + 2)