Calculer et donner le resultat sous la forme d'une fraction la plus simple : 1: A:26sur21-6sur3x2sur7 b:3-3x5sur12 c:(7sur3+1sur4)x3sur62

1
a: 26/21 - 6/3 x 2/7
ça a buguer
26/21 - 6/3 x 2/7 = 26/21 - 12/21 = 14/21 = 2x7/3x7 = 2/3
b: 3-3x5/12 = 3-15/12 = -12/12 (=-1)

Réponses

2014-01-04T14:37:34+01:00
A:26/21-6/3x2/7 
=26/21-12/21
=14/21
=2/3
 
b:3-3x5/12
=3-15/12
=36/12-15/12
=21/12
=7/4
 
c:(7/3+1/4)x3/62
=(28/12+3/12)x3/62
=31/12x3/62
=3/24
=1/8