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UID989615在线时间 小时注册时间2014-3-16最后登录1970-1-1主题帖子性别保密 
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| 一个今天想多了的问题: factors里面包不包括负因数?
 
 回答:
 Doctor Greenie:
 “But I think you will find a difference of opinion about -3 being a
 factor of 3. In my opinion, in most contexts, factors of a number are
 only positive integers. The prime factorization of a number "n" is the
 unique set of positive prime numbers which, when multiplied together,
 yield the number n. And when we list "the factors of" a number, we
 only list positive integer divisors. The "factors" of 6 are 1, 2, 3,
 and 6; we don't include -1, -2, -3, or -6 in the list.“
 
 相关链接:
 http://mathforum.org/library/drmath/view/63516.html
 
 结论:认同factors里面不包括负的因数。
 
 
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