1)Dans chaque cas, determiner mentalement.
a. 2/3 de 6L
b. 5/8 de 80Kg
c. 7/5 de 20m

2)Calculer mentalement.
a. 15/7 x 7
b. 8 x 9/4
c. 12/4 x 7
d. 5 x 8/20
si possible avec le calcule​
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