Réponses

2014-01-20T00:01:39+01:00
A) -2/1,3+2/3,9=-6/3,9+2/3,9=(-6+2)/3,9=-4/3,9

b) 7/11-12/9=63/99-132/99=(63-132)/99=-69/99=-23/33

c) 21/27-14/18=7/9-7/9=0
2014-01-20T00:53:29+01:00
A) -2/1,3 + 2/3,9 =
-6/3,9 + 2/3,9 =
(-6+2) / 3,9=
-4/3,9

b) 7/11 - 12/9 =
63/99 - 132/99 =
(63-132)/99 = -69/99=
-23/33

c) 21/27 - 14/18 =
7/9 - 7/9 =
0