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标题: 数学factor含义的请教 [打印本页]

作者: XIAOXIANGXI 时间: 2006-5-16 07:12 标题: 数学factor含义的请教

factor of n中到底包不包括１以及Ｎ本身啊？下面是ＧＷＤ中的一道题，搞不清楚呢！！！

An integer greater than 1 that is not prime is called composite. If the two-digit integer n is greater than 20, is n composite?

(1) The tens digit of n is a factor of the units digit of n.

(2) The tens digit of n is 2.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

作者: longxiaomeim 时间: 2006-5-16 19:44

应该包括其本身和1。

作者: XIAOXIANGXI 时间: 2006-5-19 07:09

那样的话，你觉得上面那题答案是什么啊!

作者: bobiouou 时间: 2006-5-19 13:18

选A啊，因为这个数大于20,所以不用考虑11的可能性，its tens digit is a factor of the number.

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