今日更新一题吧 Let S be the set of all positive integers n such that n2 is a multiple of both 24 and 108. Which of the following integers are divisors of every integer n in S ? Indicate all such integers. A 12 B 24 C 36 D 72 谁能给一个很方便的解法啊？
Six man of different heights standing in two rows with each three men, and each row is arranged as the rule that taller man is standing at the right hand side from left to right, and also the man standing at the back row is much taller than the one standing just in front of him in the front row, so how many ways can these six men be arranged? 解析的第一句 - 首先根据条件确定如下（假设6个人A，B，C，D，E，F身高依次增高） 123 A 456 EF
Six man of different heights standing in two rows with each three men, and each row is arranged as the rule that taller man is standing at the right hand side from left to right, and also the man standing at the back row is much taller than the one standing just in front of him in the front row, so how many ways can these six men be arranged? 解析的第一句 - 首先根据条件确定如下（假设6个人A，B，C，D，E，F身高依次增高） 123 A 456 EF
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发表于 2011-12-19 00:58:58
