三个三位数相乘,积怎样最大

  • 时间:2020-04-03 19:10:37
  • 分类:数学世界
  • 阅读:153 次

用1——9这九个数字组成三个三位数,每个数字只用一次,使这三个三位数相乘的积尽可能大,这三个三位数各应是多少?

解题思路:要想使这三个三位数的乘积尽可能大,必须每个三位数尽量大;要使每个三位数尽量大,必须把大的数字尽可能放在高位上。与此同时,根据《乘积最大问题》中证明的,还要兼顾到这三个数之间的差距要尽可能的小。

解答过程:

把9、8、7三个数字放在三个三位数的百位上,十位上放4、5、6三个数字,个位上放1、2、3三个数字。组合出来就是:941,852,763。

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