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O cutie + 20 mingi= 500 g. 5 mingi= 200 g. 1 cutie =?

Răspuns :

Cutia+5mingi+5mingi +5 mingi+5mingi=500g

Cutia +800 grame(mingi)=500 g
Cutia=500 g-800g
Cutia =-300 g
Proba:
-300+800=500