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Formeaza perechi de adunari si inmultiri care au acelasi rezultat,conform modelului.15+15+15+15,33+33+33,13+13+13+13+13,21+21+21+21.

Răspuns :

18×4+4×1+5×5 18+18+18+18+4+5+5×5×5×5
60,6*10,20*3,15*4        99,11*9      65,5*13     84,4*21,