Exercice 1: Factoriser en utilisant l'identité remarquable A² - B² = (A-B)(A+B)
A = x² - 25
B = 9x² - 16
C = (x + 2)² - 36
D=81 - (3x + 8)²
E = (7x + 2)² - (6x - 5)²
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