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(1)只有使5+□的和是3的倍數時,這個數才能被3整除,所以可能的數有1,4,7,只有填7時使這個數最大,所以:5□中最大填7時這個數能被3整除;(2)57的約數有1,3,19,57.故答案為:7,1、3、19、57.
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