※ 引述《landy6320 (landy)》之铭言： : prep DS1-169 : 169. 16735-!-item-!-187;#058&010875 : If the integers a and n are greater than 1 and the product of the first 8 positive integers is a multiple of an, what is the value of a ? : (1) an = 64 : (2) n = 6 : 如何得知(2)的2^6会等於64 从(2)中你怎麽会知道a等於2呢?prep DS2-60 你题目抄错了 害我看半天 呵呵 应该是a^n 因为已知n=6, 8!中 可以提出一个factor刚好是2^6 所以a=2 : 60. 4972-!-item-!-187;#058&004074 : Does the integer k have a factor p such that 1 < p < k ? : (1) k > 4! k > 1*2*3*4 但是没说k等於多少 万一k为质数 就不会有大於1且小於k的因数 : (2) 13! + 2 k 13! + 13 : 不懂(2)为什麽可以得知 这题想秒杀的话 就先不管13!是多少 假设13!得出的结果是偶数 13! + 2还是偶数 这时至少会有个因数p=2 假设13!是奇数 13! +13会是偶数 至少也会有个因数p=2 : CR PREP-2 42 : 42. (32943-!-item-!-188;#058&007554) : Researchers have found that when very overweight people, who tend to : have relatively low metabolic rates, lose weight primarily through dieting, : their metabolisms generally remain unchanged. They will thus burn : significantly fewer calories at the new weight than do people whose : weight is normally at that level. Such newly thin persons will, therefore, : ultimately regain weight until their body size again matches their metabolic : rate 我试着解释看看 学者发现 过重的人代谢率也比较低 他们要靠节食来减重的话 代谢率会维持不变 就算他们瘦身成功了 他们燃烧的卡路里比起一般人少 所以这些瘦身成功的人 会再度变胖 直到符合他们代谢率水准的程度 : The conclusion of the argument above depends on which of the following : assumptions? : (A) Relatively few very overweight people who have dieted down to a new : weight tend to continue to consume substantially fewer calories than : do people whose normal weight is at that level. 减肥成功的胖子很少持续吃较少的卡路里 : (B) The metabolisms of people who are usually not overweight are much more : able to vary than the metabolisms of people who have been very : overweight. 体重正常的人 代谢率的变化比胖子大 : (C) The amount of calories that a person usually burns in a day is determined : more by the amount that is consumed that day than by the current weight : of the individual. 人们每天燃烧的卡路里多寡 比较是由他每天摄取的量来决定 而非他的体重来决定 : (D) Researchers have not yet determined whether the metabolic rates of : formerly very overweight individuals can be accelerated by means of : chemical agents. 学者尚未知道胖子的代谢率可藉由药物来改变 : (E) Because of the constancy of their metabolic rates, people who are at : their usual weight normally have as much difficulty gaining weight as : they do losing it. 因为代谢率是稳定的 体重正常的人要增重比减重困难 答案应该是A吧 因为题目的结果就是胖子会复胖成跟他原本就很低的代谢率相符的水准 表示很少会有胖子能持续吃很少 所以就复胖了 : 觉得题目好绕喔 看不太懂他的意思 不知道他要问什麽 : 拜托哪位牛人赶快解救我吧 拜托拜托 谢谢! -- No doubt, just keep walking --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 118.168.83.102