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Efectuati :10/13+14/13,2/3+1langa 2/3,21/15+16/20

Răspuns :

10/13 + 14/13 = 24/13
2/3 + 1 si 2/3 = 2/3 + 5/3 = 7/3
21/15 + 16/20 = 7/5 + 4/5 = 11/5