Bonjour, svp aidez moi je vous en supplie !! fraction: sur =la barre de fraction a) 2 sur 3 x 7sur 9 -1 sur 3 b) 12x5sur8-1sur4 c) 13sur15-4sur15x3sur4 merci be

Bonjour,Chatongarouloup
Voilà la réponse

a) 2/3 x 7/9 -1/3 
a)14/27-1/3 =
a)14/27-9/27 = 5/27

b) 12/1 x 5/8-1/4 
b) 60/8 - 1/4 =
b) 60/8 - 2/8 = 58/8= 29/4

c) 13/15-4/15 x 3/4
c)13/15-12/60
c)52/60-12/60=40/60 = 20/30=2/3

Bonjour,

a) 2/3 x 7/9 -1/3 
= 14/27 - 1/3
= 14/27 - 1 x 9 / 3 x 9
= 14/27 - 9/27
= 5/27

b) 12x5/8-1/4 
= 60/8 - 1/4
= 60/8 - 1 x 2 / 4 x 2
= 60/8 - 2/8
= 58/8
= 2 x 29 / 2 x 4
= 29/4

c) 13/15-4/15x3/4
= 13/15 - 12/60
= 13 x 4 / 15 x 4 - 12/60
= 52/60 - 12/60
= 40/60
= 20 x 2 / 20 x 3
= 2/3