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13. Calculează. a) 27.39 - 39.26 b) 97 +97.99 c) 37.63 +3724-87-35 d) 3.34 -(34):32 +39-03 e) 2:4+ 3:9:3 f) 2-[(3-52-2'. 18:32 +3.11):24 +6] va rogggg​