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January 2021
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Bonsoir pourriez vous m aider pour l exercice 71et72 j ai essayer mais je n arrive pasmerci d avance
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Exercice 72:
A= (2x + 3) (4x + 1)
A= 2x × 4x + 2x × 1 + 3 × 4x +3 × 1
A= 8x² + 2x + 12x + 4x
A= 8x² + 14x + 4
B= (3x - 1) (2x + 4)
B= 3x × 2x + 3x × 4 - 1 × 2x - 1 × 4
B= 6x² + 12x - 2x - 4
B= 6x² + 10x - 4
C= (5x + 1) (2x - 4)
C= 5x × 2x + 5x × (-4) + 1 × 2x + 1 × (-4)
C= 10x² - 20x + 2x - 4
C= 10x² - 18x - 4
D= (2x - 5) (4x - 3)
D= 2x × 4x + 2x × (-3) + (-5) × 4x + (-5) × (-3)
D= 8x² - 6x - 20x + 15
D= 8x² - 26x + 15
dsl pour l'exercice 71 j'ai pas réussis a le faire
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A= (2x + 3) (4x + 1)
A= 2x × 4x + 2x × 1 + 3 × 4x +3 × 1
A= 8x² + 2x + 12x + 4x
A= 8x² + 14x + 4
B= (3x - 1) (2x + 4)
B= 3x × 2x + 3x × 4 - 1 × 2x - 1 × 4
B= 6x² + 12x - 2x - 4
B= 6x² + 10x - 4
C= (5x + 1) (2x - 4)
C= 5x × 2x + 5x × (-4) + 1 × 2x + 1 × (-4)
C= 10x² - 20x + 2x - 4
C= 10x² - 18x - 4
D= (2x - 5) (4x - 3)
D= 2x × 4x + 2x × (-3) + (-5) × 4x + (-5) × (-3)
D= 8x² - 6x - 20x + 15
D= 8x² - 26x + 15
dsl pour l'exercice 71 j'ai pas réussis a le faire