若
是能被3整除的五位数,则k的可能取值有______ 个;这样的五位数中能被9整除的是________ .
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2021九年级·全国·竞赛 查看更多[1]
(已下线)【竞赛】第四章 整数的可整除性特征
更新时间:2021-08-10 07:26:21
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【知识点】 整除性
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【推荐1】一个两位正整数m,如果m满足各数位上的数字互不相同且均不为0,那么称m为“相异数”,将m的两个数位上的数字对调得到一个新数
,把
放在m的后面组成第一个四位数,把m放在
的后面组成第二个四位数,我们把第一个四位数减去第二个四位数后所得的差再除以
所得的商记为
.例如:
时,
,
,则
_________;若s,t都是“相异数”,其中
,
(
,
,
且a,b,x,y为整数)规定:
若
满足被5除余1,且
,则
的最小值是_____.
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【推荐2】若一个四位数满足百位数字和十位数字相同,千位数字与个位数字之和为7,这样的数称为“同七数”. 已知M为一个“同七数”,且M可以被9整除. 将M的各个数位数字之和记为
,则可求出
的值是________ (请填入具体数字). 将M的个位数字与千位数字的差记为
,并令
当
是整数时,则满足条件 M 的最大值与最小值的差是________ .
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