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Ce nr naturale formate numai din zeci si unitati il pot inlocui pe a in expresia 40<a<_80​

Răspuns :

Răspuns:

41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79