Réponses

2014-05-09T12:20:45+02:00
:2÷4 = 2/4 = 1/2

5÷9 =5/9

8÷16= 8/16 = 1/2 

13÷25 = 13/25

 18÷36 = 18/36 =9/18 = 1/2

 25÷49 = 25/49

donc 2/4 = 8/16 = 18/36