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19. Calculaţi: a) [(73)¹¹ · 7³] : [72³ · (6° +36¹² : 623)]; c) [521: (1 +810:4¹4)19-1]: (4¹5: 89); b) [(3-4¹5: 810)¹7 16²]: (2-2²-4²)³; d) [(7-25-87:4¹3): 3 + 114⁹: [(9²)³].​