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能被9整除的數的特徵: 如果一個數的各位上的數位的和能被9整除,那麼這個數就能被9整除. 能被11整除的數的特徵: 如果一個整數奇數位數位與偶數比特數位和的差能被11整除,那麼這個數就能被11整除. 能被7和13整除的數的特徵: 一個整數末三比特與末三比特以前的數的差能被7或13整除,那麼這個數就能被7或13整除. 小學五年級(奧數點撥)裏有.
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