Réponses

2014-10-02T17:13:17+02:00
A = 3
b = -2

2a + 3b
2*3 + 3*-2 = 6-6 = 0


a - 5b
3 - 5*-2 = 3 + 10 = 13

ab + 4
3*-2 + 4 = -6+4 = -2

(a+b) (a-b)
(3-2) (3+2) = 5