07年1月梦队讨论专贴 新增cc的RC突破计划

dreamhope

队长是怎么查到的呀，我在北京，很想知道目前还可以预定的考试日期，多谢了

ycflypig

to dreamhope

我是在mba.com上面查到的

colorful_na

what is the least number of digits (including repetitions) needed to express 10的１００次方in decimal notation ?发个数学题,大家看看....

colorful_na

前提是研究者发现四个星期不换牙刷就会得一些疾病,结论是所以我们要在不超过四个星期的时候换牙刷来防止那些疾病

这个里面研究者存在的一个问题是他只对部分样本进行了研究(即用了四个星期以上的牙刷)而没有对样本的另一部分进行研究(即用牙刷不超过四个星期的人),如果这些人也同样会得这些疾病,受到感染的话，那么他的研究就是没有意义的.不管牙刷用多长时间，大于还是小于四个星期,都会受到感染,那么就得不到结论要至少四个星期换一次牙刷.

colorful_na

前提是研究者发现四个星期不换牙刷就会得一些疾病,结论是所以我们要在不超过四个星期的时候换牙刷来防止那些疾病

这个里面研究者存在的一个问题是他只对部分样本进行了研究(即用了四个星期以上的牙刷)而没有对样本的另一部分进行研究(即用牙刷不超过四个星期的人),如果这些人也同样会得这些疾病,受到感染的话，那么他的研究就是没有意义的.不管牙刷用多长时间，大于还是小于四个星期,都会受到感染,那么就得不到结论要至少四个星期换一次牙刷.

dreamhope

以下是引用colorful_na在2006-11-13 12:57:00的发言：
what is the least number of digits (including repetitions) needed to express 10的１００次方in decimal notation ?发个数学题,大家看看....

10的2次方用3=2+1个digit，则10的100次方需要101个digit，

请指教

cccccc0

再问逻辑~~

172. There is a great deal of geographical variation in the frequency of many surgical procedures—up to tenfold variation per hundred thousand between different areas in the numbers of hysterectomies, prostatectomies, and tonsillectomies.

To support a conclusion that much of the variation is due to unnecessary surgical procedures, it would be most important to establish which of the following?
(A) A local board of review at each hospital examines the records of every operation to determine whether the surgical procedure was necessary.
(B) The variation is unrelated to factors (other than the surgical procedures themselves) that influence the incidence of diseases for which surgery might be considered.
(C) There are several categories of surgical procedure (other than hysterectomies, prostatectomies, and tonsillectomies) that are often performed unnecessarily.
(D) For certain surgical procedures, it is difficult to determine after the operation whether the procedures were necessary or whether alternative treatment would have succeeded.
(E) With respect to how often they are performed unnecessarily, hysterectomies,  prostatectomies, and tonsillectomies are representative of surgical procedures in general.
这题有个地方绕不过来
目的是要support "variation is due to unnecessary surgical procedures" 也就是要support V是因为unnecessary SP导致的
而答案(B) The variation is unrelated to factors (other than the surgical procedures themselves) that influence the incidence of diseases for which surgery might be considered. 答案不就是说 V与~SP得因素无关，即V与SP有关，不就不能support上面的：V是因为unnecessary SP导致的

谢谢大家的解答~~~

raymond6

以下是引用cccccc0在2006-11-13 19:16:00的发言：

再问逻辑~~

172. There is a great deal of geographical variation in the frequency of many surgical procedures—up to tenfold variation per hundred thousand between different areas in the numbers of hysterectomies, prostatectomies, and tonsillectomies.

To support a conclusion that much of the variation is due to unnecessary surgical procedures, it would be most important to establish which of the following?
(A) A local board of review at each hospital examines the records of every operation to determine whether the surgical procedure was necessary.
(B) The variation is unrelated to factors (other than the surgical procedures themselves) that influence the incidence of diseases for which surgery might be considered.
(C) There are several categories of surgical procedure (other than hysterectomies, prostatectomies, and tonsillectomies) that are often performed unnecessarily.
(D) For certain surgical procedures, it is difficult to determine after the operation whether the procedures were necessary or whether alternative treatment would have succeeded.
(E) With respect to how often they are performed unnecessarily, hysterectomies,  prostatectomies, and tonsillectomies are representative of surgical procedures in general.
这题有个地方绕不过来
目的是要support "variation is due to unnecessary surgical procedures" 也就是要support V是因为unnecessary SP导致的
而答案(B) The variation is unrelated to factors (other than the surgical procedures themselves) that influence the incidence of diseases for which surgery might be considered. 答案不就是说 V与~SP得因素无关，即V与SP有关，不就不能support上面的：V是因为unnecessary SP导致的

谢谢大家的解答~~~

要求：支持sp->v

取非

sp->v的逆命题是v->sp，
v->sp的否命题是v->非sp，找答案b的形式就是v->非sp

逆否命题=原命题

nicholas_du

以下是引用colorful_na在2006-11-13 12:57:00的发言：
what is the least number of digits (including repetitions) needed to express 10的１００次方in decimal notation ?发个数学题,大家看看....

 谁能解释一下这题中文的意思？

gobeyond

以下是引用dreamhope在2006-11-13 16:12:00的发言：

10的2次方用3=2+1个digit，则10的100次方需要101个digit，

请指教

i agree.

题目问：10的100次方需要多少个数字表达，包括重复的数字。