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Calculeazza rapid dupa model folosind propriatatile inmultirii
Model : 5x12 egal 5x2x6
egal 10x6 egal
egal 60 Calculati ermatoarel aclcule l-a fel


a) 5x 18
5x 36
2x 45
5x 16


Răspuns :

a) 5x2x9=10x9=90
   5x4x9= 20x9=180
   2x5x9=10x9=90
   5x16=5x2x8=10x8=80

Adica descompui 18 convenabil in 2x9 si la celelalte la fel.
  
5x1x8=40
5x3x6=90
2x4x5=40
5x1x6=30