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21. Calculaţi: a) 125203: {73-(520.530)12+18 (2520: 510)20 +34 [(512.51³)8]³}; b) 125201: (3 [(510.540)216 +(62510: 510)20 + [(256-513)6]}; c) 81101: {(312.328) 10 + (915: 310)20 + [(32.38)5]}.​