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Calculeaza
a fost răspuns

calculeaza in doua moduri 3×(19-13)

Răspuns :

3·(19-13)=3·6=18
3·19-3·13=57-39=18


3x(19-13)=3x6=

               =18

3x(19-13)=3x19-3x13=

               =57-39=

               =18 

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