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标题: 一道PREP题求解~~~~ [打印本页]

作者: ccmoomer    时间: 2011-11-8 06:55     标题: 一道PREP题求解~~~~

7、If the prime numbers p and t are the only prime factors of the integer m, is m a multiple of p^2t ?

(1) m has more than 9 positive factors.

(2) m is a multiple of p^3.
【思路】
t are the only prime factors of the integer m,m沒有其他質因數,故m為t所組成,有可能為m=t,m=.................
(1) m has more than 9 positive factors 可知m>t^9, 但無法知道和p的關係,NOT sufficient
(2) m is a multiple of p^3 ,p為m的質因數,又t are the only prime factors of the integer m,t=m, m is a multiple of ,可以寫成m is a multiple of p^2t,sufficient
答案看不明白啊~~~~
作者: 87338618    时间: 2011-11-8 21:45

lz,根据我的理解应该选E,个人感觉答案错误。m这个数应该等于p的x次乘以t的y次。那么如果p为3,t为7,x为3,y为7,则都不成立。手机打字见谅哈~
作者: Rachel夏夕空    时间: 2011-11-10 06:35

如果题目没错的话,肯定是E
作者: Kminami    时间: 2011-11-10 20:52

我选的也是E,实在是不理解B选项怎么得出来的~~~




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