Réponses

2014-09-25T17:55:47+02:00

Bonjour


5/4 + -7/6

= 5/4 - 7/6

= 30/24 - 28/24

= 2/24

= 1/12


-2/5 + 1/3

= 1/3 - 2/5

= 5/15 - 6/15

= -1/15