Réponses

2013-03-07T16:14:52+01:00

a= 10sur21 - 1sur42 + 5sur2

a=20sur42 - 1sur42 + 30sur42

a=49sur42

a=7sur6

 

b=1sur3 + 1sur6 +1sur9 + 1sur 18

b=6sur18+3sur18+ 2sur18 +1sur18

b=12sur 18

b=2 sur 3

 

c= 17sur 40 +3sur10 - 3sur5

c=17sur40+ 12sur40- 24sur 40

c=53sur 40

 

d=1sur4 - 1sur 7 +1sur14-1sur28

d=7sur28-4sur28+2sur28-1sur28

d=4sur28

d=1sur7

 

2013-03-07T16:44:13+01:00

Coucou ! 

 

A = 10/21 - 1/42 + 5/2

A =20/42 - 1/42 + 30/42

A =49/42

A =7/6

 

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