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Meilleure réponse !
2014-05-02T11:45:55+02:00
Bonjour

N°29
a) 3/6 x 8 = 24/6 = 4
b) 7/2 x 16 = 112/2 = 56
c) 17 x 8/80 = 17 x 1/10 = 17/10

N°30
a) 11/2 x 0.1 = 1.1/2 = 11/20
b) 25 x 9/5 = 225/5 = 45
c) 4/200 x 25 = 100/200 = 1/2

N°31
a) 4/15 x 7 = 28/15
b) 9 x 5/11 = 45/11
c) 8/13 x 3 = 24/13

N°32
a) 23 x 2/17 = 46/17
b) 5/21 x 17 = 85/17
c) 15 x 3/23 = 45/23

N°36
a) 3/2 de 25 cm = 37.5 cm
b) 4/7 de 49 m = 28 m

N°37
3/4 de 60 minutes = 45 minutes
11/8 de 16h = 22 h

N°38
5/8 de 1.6l =  1L
4/3 de 0.15 cl = 0.2 cl