Exercice 1 : Ecrire sous forme de produit de facteurs chacune des expressions suivantes. A = x² + 3x     
B = x² - 4
C = x² + 6x +9 

Exercice 2 : Résoudre les systèmes suivants.
(2x + 3y = 5
(-3x + y = 1

(4t - 3u = 1/2
(u - 3/2t = -2
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