EXERCICE 32 Simplifier les expressions suivantes: A = 7x+8x + 2x B=9x-4x+x C = 4a + 2a-3a + 5a D=t+8t+10t EXERCICE 33 Simplifier les expressions suivantes : A = 5 x (x + 2) +3 B = 3 x (a + 1) + 4(a + 3) c = 7x + 4x(x - 2) D = 9x + 2y + 3x + 4y​