Réponses

2014-10-29T15:16:14+01:00
A = 3/1 - 20/21 x 7/5
A= 3/1 - 150/105
A= 315/ 105 - 150/105
A= 165/105
A= 33/21 = 11/7

B= (2/7 - 1/3) x 7/4 - 5/4
B= (6/21 - 7/21) x 7/4 - 5/4
B= - 1/21 x 7/4 - 5/4
B= -7/ 84 - 5/4
B= -7/84 - 105/84
B= -112/84
merci beaucoup, franchement merci !!!!!!!!!!!! tu geres