Bonsoir,
Exercice numéro 7 :
L = (2x + 10)² - (2x + 9)²
L = 4x² + 40x + 100 - (4x² + 36x + 81)
L = 4x + 19
2010² - 2009² = (2 × 1000 + 10)² - (2 × 1000 + 9)² = 4 × 1000 + 19 = 4019
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Bonsoir,
Exercice numéro 7 :
L = (2x + 10)² - (2x + 9)²
L = 4x² + 40x + 100 - (4x² + 36x + 81)
L = 4x + 19
2010² - 2009² = (2 × 1000 + 10)² - (2 × 1000 + 9)² = 4 × 1000 + 19 = 4019