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能被11整除的數的特徵 把一個數由右邊向左邊數,將奇位上的数字與偶位上的数字分別加起來,再求它們的差,如果這個差是11的倍數(包括0),那麼,原來這個數就一定能被11整除.例如:判斷491678能不能被11整除.—→奇位数字的...
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