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4必須填1,其他的答案就是5位數了. 第二問號應該是4或者9,才能得到個位是6. 當第一個問號為0時,只有504*14=7056. 當第二個問號為9時,有4*x+3+x=5X+3不可能是10的倍數,就是得不到0. 只有一組答案.504*14=7056
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