12 4/5 = ((12*5) + 4)/5 = (60 + 4)/5 = 64/5
14,5 = 14 1/2 = ((14*2)+1)/2 = (28+1)/2 = 29/2
64/5 + 29/2 = (64*2)/10 + (29*5)/10 = 128/10 + 145/10 = 273/10 = 27.3
Ответ: 27.3
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12 4/5 = ((12*5) + 4)/5 = (60 + 4)/5 = 64/5
14,5 = 14 1/2 = ((14*2)+1)/2 = (28+1)/2 = 29/2
64/5 + 29/2 = (64*2)/10 + (29*5)/10 = 128/10 + 145/10 = 273/10 = 27.3
Ответ: 27.3