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Calculaţi: a) [(1 +3²-2)-5-7-8²-2"; b) (18:18²-17: 17+15:5)-2-3; e) {[(2 9): (2-3)²+28]:5}"; d) 742-3¹ (446-2 (271-5² (3 3:3":31). $. Calculati:






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