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Calculati: a) 2.54+ 3. 56 = b) 10-2.1 = c) 2.53 3.5 d) 45.48:12 e) [2.5 (1.5-1.25 0.4):2 1:(0.3+ e+25 ++ 1.5-0.15). 10 - 15.9.0.5) 100​