a̅b̅c̅ + b̅c̅ + c̅ = 1081
100a+10b+c+10b+c+c = 1081
100a+20b+3c = 1081
3c-1 = 1080-100a-20b
3c-1 = 20(54-5a-b)
3c-1 e divizibil cu 20 ⇒ c = 7 (singura posibilitate.)
20 = 20(54-5a-b)
54-5a-b = 1
5a+b = 53
⇒ a = 9, b = 8 (singura posibilitate.)
987 + 87 + 7 = 1081
