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Sagot :

Bonjour

A = (x + 2)² = x² + 4x + 4

B = (y - 3)² = y² - 6y + 9

C= (3a + 4)² = 9a² + 24a + 16

D = (7 - 2b)² = 49 - 28b + 2b²

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