Effectuer chacun des trois calculs suivant en choisissent la méthode la plus adapté
a= 12_× 17 b= 7_× 25 c= 6_ × 14
2 5 4
a= 12_× 17 b= 7_× 25 c= 6_ × 14
2 5 4
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Bonsoir12/2 x 17 = 6 x 17 = 102
7/5 x 25 = 7 x 5 = 35
6/4 x 14 = 6/2 x 7 = 42/2 = 21
6*10 = 60
6*7=42
60+42= 102
b)7/5=1,4
1,4*20 =28
1,4*5 =7
28+7=35
c)6/4=1,5
1,5*10=15
1,5*4=6
15+6=21
*= multiplier !!