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afla prin scaderea repetata de cite ori 3se cuprindein 9;12;15.

Răspuns :

9-3-3-3=0
12-3-3-3-3 =0
15-3-3-3-3-3 =0
9-3-3-3=0
12-3-3-3-3=0
15-3-3-3-3-3=0
sper ca te-am ajutat.