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凡能被7、11、13整除的数都具有一定的特征:如果这个数的末三位数字所表示的数与末三位数字前面的数字所表示的数的差能被7、11、13整除,那么,这个数就能被7、11、13整除。能被11整除的数还有一个特征,那就是:这个数的奇数位上的数字之和与偶数位上的数字之和的差能被11整除。
Any number that can be divided by 7, 11, and 13 has certain characteristics: If the difference between the number represented by the last three digits of this number and the number indicated by the number preceding the last three digits can be used by 7, 11, 13 Divide, then, this number can be divisible by 7,11,13. Another characteristic that can be divided by 11 is that the difference between the sum of the numbers on the odd digits of the number and the sum of the digits on the even digits can be divided by 11.