Réponses

2014-03-22T19:26:35+01:00
2014-03-22T20:55:45+01:00
Bonsoir

A = 6/7 - 4/7 x 5/2
A = 6/7  - 20/14
A = 12/14 - 20/14
A = - 8/14 = - 4/7

B = (2 -1/3) : ( 5 + 5/6)
( 6/3 -1/3) : (30/6 - 5/6)
5/3 : 25/6 = 5/3 x 6/25 = 30/ 75 = 6/15

C = 2/5 : (3 -7/10)
2/5 : ( 30/10 -7/10)
2/5 : 23/10
2./5  x 10/23
20/ 115 = 4/ 23