Réponses

2014-09-05T22:22:48+02:00
Calculer les expressions suivantes :

a) 5/3 + 6/4 = 5 x 4 / 3 x 4 + 6 x 3 / 4 x 3 = 20/12 + 18/12 = 38/12 = 2 x 19 / 2 x 6 = 19/6

b) -8/5 + 3/ 2 = - 8 x 2 / 5 x 2 + 3 x 5 / 2 x 5 = - 16/10 + 15/10 = - 1/10

c) x/6 - 2x/6 = x - 2x = - x

d) x - 4/2 + x + 2/3
= 6x/6 - 12/6 + 6x/6 + 4/6 = 6x - 12 + 6x + 4 = 12x - 8