Réponses

2014-01-05T10:56:43+01:00
Bonjour

3/4 +5/2 -7/6
9/12 +30/12 - 14/12
 = 39/12 - 14/12 = 25/12

9/5 : 25/3 = 9/5 x 3/25
= 27/125

-15/12 x -8/5 x -2
= -240/60 = -4

(3/4+1) x ( 5/2 -7/6)
(3/4 + 4/4) x ( 15/6 - 7/6)
7/4 x 8/6
56/24
= 7/3

(1 -3/2) : (2 +1/4)
(2/2 -3/2) : (4/4 +1/4)
-1/2 : 5/4
- 1/2 x 5/5
= -5/10 = -1/2

4/5 -7/9 x 5/3 +2
4/5 - 35/27 +2
108/135 - 175/135 + 270/135
= 203/135