标题: 求数学198. If n = 4 p,实在看不懂og解释 [打印本页] 作者: ahasusanna 时间: 2012-7-7 11:54 标题: 求数学198. If n = 4 p,实在看不懂og解释
看不懂，跪求中文解释！
解释中for example p=3，如果p=任何一个质数代入呢？为什么答案只有四个呢？
198. If n = 4 p, where p is a prime number greater than 2,
how many different positive even divisors does n have,
including n ?
(A) Two
(B) Three
(C) Four
(D) Six
(E) Eight
Since p is a prime greater than 2, p must be odd.
therefore, the possible even divisors of n = 4 p are
2, 4, 2p, and 4 p. Alternatively, choose such a
prime, for example p = 3, and determine the
number of positive even divisors that n = 4 p = 12 has.
the correct answer is C.作者: taozhexiong 时间: 2012-7-9 20:32
