Réponses

Meilleure réponse !
2014-03-07T15:05:28+01:00
A = 5/7 + 14/25 x 15/49
A = 5/7 + 14 x 15
               25 x 49
A = 5/7 + 210/1225
A = 5 x 175 / 7 x 175 + 210/1225
A = 875/1225 + 210/1225
A = 1085/1225
A = 35 x 31 / 35 x 35
A = 31/35

B = (1 - 1/3 - 3/5 x 2/3 ) x 7/4

B = (1 - 1/3 - 3 x 2) x 7/4
                   5 x 3
B = (1 - 1/3 - 6/15) x 7/4
B = (1 x 15 / 1 x 15 - 1 x 5 / 3 x 5 - 6/15) x 7/4
B = (15/15 - 5/15 - 6/15) x 7/4
B = 4/15 x 7/4
B = 4 x 7
     15 x 4
B = 28/60
B = 4 x 7 / 4 x 15
B = 7/15