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890b = -8999a+991c+80 b = (-8999a+991c+80) / 890 .....(2)
利用(1),(2)可計算 c,a,b之值為: 檢視圖片 唯一能成立之解為: c = 9 , a = 1 , b = 0 故原數為1089
Ans: 1089
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