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rezolva prin scădere repetată dupa model 16:4=4 16-4-4-4-4=0

Răspuns :

18:2=18-2-2-2-2-2-2-2-2-2=0;9:3=9-3-3-3=0;27:9=27-9-9-9=0;21:3=-3-3-3-3-3-3-3=0;