а)1628.22 б) 16.4 в)601 г)2.65 

а) 279.48 + 105.24 = 384.72             1243.5 + 384.72 = 1628.22

б) 12.652 - 0.7 = 11.952                    28.348 - 11.952 = 16.396

в) 600 - 541.3 = 58.7               542.3 + 58.7 = 601

г) 38.45 - 27.35 = 11.1           11.1 - 8.45 =  2.65