Réponses

Meilleure réponse !
2014-04-10T17:32:47+02:00
Simplifier puis calculer

a. 7/3  x 3/8 = 21/24 = 3 x 7 / 3 x 8 = 7/8

b.2/21 x 7/5 = 14/105 = 7 x 2 / 7 x 15 = 2/15

c. 12/5  x  5/7 = 60/35 = 5 x 12 / 5 x 7 = 12/7

d. 40/7  x  1/8 = 40/56 = 8 x 5 / 8 x 7 = 5/7

e. 36/11  x  1/9
= 36/99 = 9 x 4 / 9 x 11 = 4/11