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Efectuați a 3/7 + 2/7 b 3/6 + 2/6 c 3/10 + 4/10; d 7/15 + 7/15 e 8/10 + 2/10 f 2/9 + 5/9 g 3/11 + 5/11 h 4/13 11 + 11/13 i 7/15 + 3/15 j 3/8 + 1/8 + 2/8 k 5/18 + 3/18 + 7/18 l 7/29 + 3/29 + 28/29​