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設積的前幾位數形成的值為X.則有:100≤(1000X + 123)÷13≤999顯然2≤X≤12變形得:100≤77X + 9 -(X - 6)/13≤999要使(X - 6)/13是一個整數,X = 6、19、32……等形如13T + 6的數結合2≤X≤12…
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