Réponses

Meilleure réponse !
2014-10-15T11:23:11+02:00
13/14 -1/15 x 10/7
= 13/14  -1 x 5 x 2 / 5 x 3 x 7
= 13/4 -2/21
= 13 x 21 / 4 x 21  -2 x 4 / 21 x 4
= 273/84   -8/84
= 265/84


(1/5  -2/3) : (2 +1/3)
= 1 x 3 / 5 x 3   -2 x 5 / 3 x 5 : 2 x 3 / 1 x 3  +1 x 1 / 3 x 7
= 3/15 -10/15 : 6/3 +1/3
= -7/15 : 7/3
= -7/15 x 3/7
= -3/15
= -3 x 1 / 5 x 3
= -1/5