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Sagot :

AYUDA

bjr

C = (3a)² - 2² = (3a+2) (3a-2)

puisque a² - b² = (a+b) (a-b)

D = n * 7n - n * 3 = n (7n - 3)

et

E = 3 * 6 + 3 * 5t = 3 (6 + 5t)

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