Réponses

2013-02-12T16:41:06+01:00

exercice 1:

1)5/9+3/27=15/27+3/27=18/27

2)1/7+2/5=19/35

3)1/6-2/3=1/6-4/6=-3/6=-1/2

5)11/7*9/6=99/42

6)-8/3*7/5=56/15

8)-20/12+40/16=-320/192+480/192=160/192=5/6

4)8/5-3/4=32/20-15/20=17/20

7)-2/5+-6/13=-26/65+ -30/65=-56/65