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除以9餘8可以看成加上1就被9整除 同理:這個數加上1就被9 7 5整除(因除以九時餘八一定除以三時餘二)故這個數加上1是315的倍數 315除11餘7要找到一個315的倍數减1是11的倍數7*8-1=55是11的倍數 故315*8-1=2519是11的倍數所以這個數是2519
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