Réponses

Meilleure réponse !
2014-03-14T12:47:40+01:00
A = 52/14 : (-13) =
A = 52/14 x 1/-13
A = 52/182
A = 26 x 2 / 26 x 7
A = -2/7

B = - 7/10 - 5/12
B =  -7 x 12 / 10 x 12 - 5 x 10 / 12 x 10
B = -84/120 - 50/120
B = -134/120
B = 2 x -67 / 2 x 60
B = -67/60

C= -27/25 x -15/-18
C = -27 x -15
        25 x -18
C = 405/-450
C = 45 x  9 / 45 x -10
C = -9/10