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11^10-1=(11^5-1)(11^5+1)=(11-1)(1+11+11^2+11^3+11^4)(11^5+1)=10(1+11+11^2+11^3+11^4)(11^5+1)又因為(1+11+11^2+11^3+11^4)末尾數為5,(11^5+1)末尾數為2,是偶數所以11^10-1能被100整除
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