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Verifica egalitatea: (1+2+3+...20):(1+2+3+...14)=2

Răspuns :

(1+2+3+...+20):(1+2+3+....+14)=2(A)
=(20*21:2):(14*15:2)=2(A)
=(10*21):(7*15)=2(A)
=210:105=2(A)