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Réponse :

Ex 2

a) 1/9+2/3

=1/9+6/9

=7/9

b)5/18-1/9

=5/18-2/18

=3/18=1/6

c)2/3-1/9+5/18

=12/18-2/18+5/18

=15/18=5/6

d)2/3-5/18 +2/3-1/9

=12/18-5/18+12/18-2/18

=17/18

Ex 3

2/15+1/9

=6/45+5/45

=11/45

donc 45/45 -11/45=34/45

donc Rania et Rachelle prennent

(34/45):2=34/45*1/2=34/90 =17/45