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13. Calculaţi: a) -52: (19-32)-2 [18+44: (-11)]; b) [25-24: (11-14)] [-9+8: (27-35)]; c) (-3)° :(-3)* (12-3²)-2[4² +11:(-11)]; d) 10²-105:10³ (15−14)⁹⁹ +3[5³ −(−2²)³]. lati: 99​