Réponses

2012-09-13T19:03:24+02:00

a=4/5+8/15-3,6/1,5

  =4x3/5x3+8/15-3.6x10/1.5x10

  = 12/15+8/15-36/15

  = 20/15-36/15

  = -16/15


b=10/9-7/9x5/3

  = 10/9-35/27

  = 10x3/9x3-35/27

  = 30/27-35/27

  = -5/27