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13. Efectuați: a) 6 (6+6 [64-(62)2+12]} +3-6²-4-12; b) (9+36:92).5+81 82:41:32-(20142015); c) 11844:252-3-(27-25-337-2)+572:13; d) (5313:231+17):4+3 [34782:341-4 (676: 169+21)].​

13 Efectuați A 6 66 6462212 36412 B 93692581 82413220142015 C 1184425232725337257213 D 53132311743 347823414 676 16921 class=