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英语翻译This property of square numbers was referred to in a "pu

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英语翻译
This property of square numbers was referred to in a "puzzler" feature of a March 2008 broadcast of the NPR radio show "Car Talk." In this Puzzler,a son tells his father that his computer and math teacher assigned the class a problem to determine if a number is a perfect square.Each student is assigned a particular number,and the students are supposed to write a software program to determine the answer.The son's assigned number was .While the father thinks this is a hard problem,a bystander listening to the conversation states that the teacher gave the son an easy number and the bystander can give the answer immediately.The question is what does this third person know?The answer is that the number ends in the digit "2," which is not one of the possible last digits for a square number.
2008年3月NPR广播节目“车迷天下”的一期节目以“谜题”为主题,其中谈到了完全平方数的性质.在这个谜题中,儿子告诉父亲,他的电脑和数学老师给他们布置了一个任务,要判断一个数字是不是完全平方数.每个学生都被分派了一个特定的数字,并且被要求编写一个程序来判定这个数字.儿子拿到的数字是 .当父亲觉得这是个很难得问题时,一位一直在旁边听着的路人说老师给了儿子一个很简单的数字并且他可以立即给出答案.问题就是这个第三个人到底知道什么?答案是这个数字是以2结尾的,而以数字2并不是完全平方数的可能尾数.