Devoir n
o2 - Identit´ es Remarquables - 3` eme 4 octobre 2013 - 15 min
Exercice 1 (1,5 pts) : Compl´eter 1. (a+b)2 =
2. (a−b)2 = 3. (a+b)(a−b) =
Exercice 2 (4 pts) : D´evelopper et r´eduire les expressions suivantes A = (x+ 2)2 =
B = (3−y)2 =
C = (2x+ 7)(2x−7) = D = (4x−3)2 =
E = (6−y)(6 +y) =
Exercice 3 (4,5 pts) : Factoriser les expressions suivantes F =x2−12x+ 36 =
G= 49y2−14y+ 1 = H = 81−100x2 = I = 25x2−80x+ 64 = J = (8x−4)2−9x2 =