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三位數xyz减去它的各個數位的數位之和用如下表示 100x+10y+z-(x+y+z)=99x+9y 這是一個9的倍數,所以4+6+a是9的倍數,且a在0-9之間,所以10-19之間只有18是9的倍數,所以a=8
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