Réponses

2012-09-20T21:08:21+02:00

((2/5)-3) / ((3/4)+(2/9))

= ((2/5)-(15/5)) / ((27/36)+(8/36))

= -(13/5) / (35/36)

= -(13/5) * (36/35)

= -468/175

 

En espérant t'avoir aidé.