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Meilleure réponse !
2013-09-21T19:38:48+02:00
Exercice 98
A = (2/3/ 8/7) : (-7/6 +3/4)
A = (2/3 X 7/8) : (-7/6 +3/4)
       14/24 : (-28/24 +18/24)
       14/24 ; ( -10/24)
14/24 X -24/10
336/240 = 112/80 = 56/40 = 28/20 = 14/10

B = (5/11 -5/8) X (33 -3/8)
(40/88 -55/88) X ( 264/8 -3/8)
-15/88 X - 261/8
+ 3915/704

C = 
3 -5/3 +2/5 45/15 -25/15 +6/15   = + 26/15 = 26/15 X 30/13 = 780/195 = 156/39
1/2 +1/3 -2/5  15/30 + 10/30 -12/30      13/30
52/ 13

D = 2/3 -3/2 +2/7 
              5 -2/7
2/3 -21/14 + 4/14  = 2/3 -17/14   = 28/42 - 51/42  = -23/42 = -23/42 X 7/33 =-161/1386
         35/7 -2/7              33/7         33/7                 33/7
- 23/198