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3,5,7,9的最小公倍數為5×7×9=315 315-1=314 這個數能被11整除,也就是314加上315的整數倍,能被11整除 314÷11=28餘6 315÷11=28餘7 6+7×7=55能被11整除 所以這個數最小為:314+315×7=2519
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