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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)* (12-3³) − 2[4² +11:(−11)]; d) 10²-105:10³ (15-14) +3[5³-(-2)].​