Réponses

2013-03-09T14:41:53+01:00
3/4-1/5=15/20-4/20=11/20

1/2-3/7=7/14-6/14=1/14

11/20:1/14=11/20*14=77/10
  • carys
  • Modératrice confirmée
2013-03-09T14:50:23+01:00

A = ((3/4) - (1/5)) / ((1/2) - (3/7))

A = ((15/20) - (4/20)) / ((7/14) - (6/14))

A = (11/20) / (1/14)

A = (11/20) * (14/1)

A = 154/20

A = 77/10

 

voilà :)