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9. Calculaţi: a) [(72)¹¹-73] [723. (60+36¹2: 623)]; c) [521: (1 +810:414)19-1]: (4¹5: 89); b) [(3-415: 810)17 16²]: (2-2²-4 d) [(7-25-87: 4¹3): 3+1]: [(9)​