Réponse :
A = 18x² + 30x - 12x - 20 = 18x² + 18x - 20
B = -8x² + 6x + 28x - 21 = -8x² + 34x - 21
C = 6x + 12 - 8x² - 16x = - 8x² - 10x + 12
D = 25x² - 20x + 4
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Réponse :
A = 18x² + 30x - 12x - 20 = 18x² + 18x - 20
B = -8x² + 6x + 28x - 21 = -8x² + 34x - 21
C = 6x + 12 - 8x² - 16x = - 8x² - 10x + 12
D = 25x² - 20x + 4