Bonsoir,
1- A = (x + 1) (x + 2) + (x + 3) (x + 4)
A = x² + 2x + x + 2 + x² + 4x + 3x + 12
A = x² + x² + 2x + x + 4x + 3x + 2 + 12
A = 2x² + 10x + 14
2- A = (2x + 3) (x + 5) + (3x + 1) (x + 3)
A = 2x² + 10x + 3x + 15 + 3x² + 9x + x + 3
A = 2x² + 3x² + 10x + 3x + 9x + x + 15 + 3
A = 5x² + 23x + 18
3- B = (3x - 4) (x + 3) - (x - 5) (x + 1) Je ne suis pas sûre de bien voir...
B = 3x² + 9x - 4x - 12 - (x² + x - 5x - 5)
B = 3x² + 9x - 4x - 12 - x² - x + 5x + 5
B = 3x² - x² + 9x + 5x - 4x - x - 12 + 5
B = 2x² + 9x - 7.
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Bonsoir,
1- A = (x + 1) (x + 2) + (x + 3) (x + 4)
A = x² + 2x + x + 2 + x² + 4x + 3x + 12
A = x² + x² + 2x + x + 4x + 3x + 2 + 12
A = 2x² + 10x + 14
2- A = (2x + 3) (x + 5) + (3x + 1) (x + 3)
A = 2x² + 10x + 3x + 15 + 3x² + 9x + x + 3
A = 2x² + 3x² + 10x + 3x + 9x + x + 15 + 3
A = 5x² + 23x + 18
3- B = (3x - 4) (x + 3) - (x - 5) (x + 1) Je ne suis pas sûre de bien voir...
B = 3x² + 9x - 4x - 12 - (x² + x - 5x - 5)
B = 3x² + 9x - 4x - 12 - x² - x + 5x + 5
B = 3x² - x² + 9x + 5x - 4x - x - 12 + 5
B = 2x² + 9x - 7.