Réponses

2014-01-20T08:23:25+01:00
A = -8/28  b =1/35  c = - 21/45
donc a= -2/7   b= 1/35    c= - 7/15

a)
calculer a- b + c =
-2/7 -1/35 - 7/15 =
-30/105 - 3/105 - 49/105 =
-82/105 

calculer b - a - c =
1/35 + 2/7 + 7/15 =
3/105 + 30/105 + 49/105 =
82/105

b) Que remarques-tu?
(- b + a +c) = -1 *(b -a - c) =
-82 /100 = -1 * (82/100)