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Sagot :

Réponse:

Exo 27

a) 3/5 x 7/2 =21/10

b)1/4 x 3/5 =3/20

c) 9/5 x 7/9= 7/5

Exo 28

a) 5/11 x 2/5 =2/11

b)4/7 x 5/2 =10/8

c) 7/3 x 6/5=14/5

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