Devoir 5éme sur 20 pts (exercice3) Aidez svp mrc

a) 2/4 de 200 l = 2/4 x 200 = 400/4 = 100 (litres)

b) 2/5 de 40 kg = 2/5 x 40 = 80/5 = 16 (kg)

c)  7/8 de 5,60 € = 7/8 x 5,60 = 39,2/8 = 4,9 (€)

d) 13/12 de 8,4 km = 13/12 x 8,4 = 109,2/12 = 9,1 (km)

Exercice 3 :

a/
2/4 de 200L = 2/4 x 200 = ( 2x 200) / 4 = 400/4 = 100 L

b/
2/5 de 40kg =2/5 x 40 = ( 2 x 40) / 5  = 80/5 =  16 kg             

c/
7/8 de 5,60€  = 7/8 x 5,6 = (7x 5,6) / 8   = 39,2/8 = 4,9 €      

d/
13/12 de 8,4km = 13/12 x 8,4 = (13 x 8,4) /12 = 109,2/12 = 9,1 km