Réponses

2012-06-10T12:46:33+02:00

3/5+1/15= 10/15=2/3

25/49*28/15=700/735=20/21

2/7*14/8+1/8=28/56+1/8=5/8  ou 0.5+1/8=5/8

3/8*(4/9+2/3)=12/72+6/24=5/12

24/9*1/4-5/3*1/9= 24/36-5/27=13/27

    ou 2/3 -5/27=13/27

7/8-(41/9-1/4)+3/8=7/8-155/36+3/8

= -55/18