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| 页次：1/3 每页50条记录， 本页显示1 到50， 共136 分页： [1] [2] [3] [下一页] [尾页] | |
| • #跟帖# When moon is between sun and earth, it blocks the radiative heat [脑筋急转] - wxcfan123(0 bytes ) 2011-12-31 | |
| • #跟帖# 要使老外看得懂，建议用indirect proof [脑筋急转] - wxcfan123(0 bytes ) 2011-12-26 | |
| • #跟帖# google "congruence" and it is "Proofs Using Congruence" check t [脑筋急转] - wxcfan123(63 bytes ) 2011-12-26 | |
| • #跟帖# google "law of identity". There is a link for it. Check if it is [脑筋急转] - wxcfan123(44 bytes ) 2011-12-25 | |
| • #跟帖# 实际上想问的是：因月球的运动，地球晚上温度会不会有周期性的变化 [脑筋急转] - wxcfan123(94 bytes ) 2011-12-24 | |
| • 由贫论员的科学问题引起的一个科学问题。 [脑筋急转] - wxcfan123(255 bytes ) 2011-12-24 | |
| • #跟帖# 人是抽成真空后放进去的？还是放进去后再开始抽，然后计算5分钟？ [脑筋急转] - wxcfan123(322 bytes ) 2011-12-23 | |
| • #跟帖# 人对温度的感觉应该与空气无关吧。比如将手放在铁上，手心和铁之间没 [脑筋急转] - wxcfan123(43 bytes ) 2011-12-19 | |
| • #跟帖# 若是线性,则答案是：f(x)=665x - 386. f(3)=1330... [脑筋急转] - wxcfan123(0 bytes ) 2011-12-09 | |
| • #跟帖# 谢谢好题。脑筋急转+数学。 [脑筋急转] - wxcfan123(0 bytes ) 2011-12-04 | |
| • #跟帖# 来一个标题党：半路杀出来的概率事件。找到了算法。概率：35/128. [脑筋急转] - wxcfan123(296 bytes ) 2011-12-04 | |
| • #跟帖# Second question. [脑筋急转] - wxcfan123(233 bytes ) 2011-12-03 | |
| • #跟帖# Why the fourth student must cut a bow to form a square? [脑筋急转] - wxcfan123(0 bytes ) 2011-12-03 | |
| • #跟帖# 这个概率有点意思了。重算概率如下。请教有不有好一点的算法？ [脑筋急转] - wxcfan123(548 bytes ) 2011-12-03 | |
| • #跟帖# 143547? [脑筋急转] - wxcfan123(0 bytes ) 2011-12-03 | |
| • #跟帖# 分法：先切一个内接正方形。再将它沿一边等分七等分。概率：1/11! ? [脑筋急转] - wxcfan123(0 bytes ) 2011-12-02 | |
| • #跟帖# 回复：圆O半径为r，弦AB将圆O分为S和s两弓形，⦟AOB = x。求：面积比s / S =？ [脑筋急转] - wxcfan123(89 bytes ) 2011-12-01 | |
| • #跟帖# 更正：R=sqrt(OP^2 + 1), 作法见内 [脑筋急转] - wxcfan123(145 bytes ) 2011-11-21 | |
| • #跟帖# 不知理解对没有。 [脑筋急转] - wxcfan123(110 bytes ) 2011-11-20 | |
| • #跟帖# 女婿。 [脑筋急转] - wxcfan123(0 bytes ) 2011-11-13 | |
| • 介绍一个很好的(如果不是最好的)数独软件-SudoGu [脑筋急转] - wxcfan123(829 bytes ) 2011-11-11 | |
| • 百度文库中有不少哥德巴赫猜想的初等证明 [脑筋急转] - wxcfan123(291 bytes ) 2011-11-06 | |
| • #跟帖# 很仔细的观察。 [脑筋急转] - wxcfan123(253 bytes ) 2011-11-05 | |
| • （ZT）科普一下西塔潘猜想 [脑筋急转] - wxcfan123(1485 bytes ) 2011-10-29 | |
| • #跟帖# 您的软件放在网上了吗。用什么写的。 [脑筋急转] - wxcfan123(0 bytes ) 2011-10-29 | |
| • #跟帖# 终于明白了，这题中的提示其实是糊弄人的。 [脑筋急转] - wxcfan123(0 bytes ) 2011-10-28 | |
| • #跟帖# 13112221? [脑筋急转] - wxcfan123(0 bytes ) 2011-10-26 | |
| • #跟帖# 这证明简洁。顶一个。 [脑筋急转] - wxcfan123(0 bytes ) 2011-10-25 | |
| • #跟帖# 当然不可能一次到位，反复应用可以解大部分免费报纸上的Sudoku [脑筋急转] - wxcfan123(0 bytes ) 2011-10-23 | |
| • #跟帖# 谢谢！同问PROF MO的中文名? [脑筋急转] - wxcfan123(0 bytes ) 2011-10-18 | |
| • #跟帖# 说真的，这只能算个说明。等LZ的答案吧。 [脑筋急转] - wxcfan123(0 bytes ) 2011-10-18 | |
| • #跟帖# 回复：理由呢？ [脑筋急转] - wxcfan123(150 bytes ) 2011-10-18 | |
| • #跟帖# 从任一方向截这物体，其截面应该是周长相同的平面图形中面积最大的-园。 [脑筋急转] - wxcfan123(0 bytes ) 2011-10-18 | |
| • #跟帖# 证明时就要用到LZ的旋转了。(纯几何证明) [脑筋急转] - wxcfan123(0 bytes ) 2011-10-17 | |
| • #跟帖# 估摸着是要将它们搞到一个平面上去。投影是不行。谢谢！ [脑筋急转] - wxcfan123(0 bytes ) 2011-10-17 | |
| • #跟帖# 很好的提示。是不是将Y作伸缩，然后将圆的结果变回来？ [脑筋急转] - wxcfan123(0 bytes ) 2011-10-17 | |
| • #跟帖# 试用纯几何方法解一下 [脑筋急转] - wxcfan123(500 bytes ) 2011-10-16 | |
| • #跟帖# 从结果可看出解法。但我的结果有点不一样。 [脑筋急转] - wxcfan123(501 bytes ) 2011-10-15 | |
| • #跟帖# 狗来一个结果： [脑筋急转] - wxcfan123(186 bytes ) 2011-10-15 | |
| • 试解津京扩展的贫论员的问题 [脑筋急转] - wxcfan123(1088 bytes ) 2011-10-14 | |
| • #跟帖# "当m = 1，根据（1）和（2），D(1) = T(2) - T(1) = 1/2 = (-1)^2 / 2! " [脑筋急转] - wxcfan123(156 bytes ) 2011-10-13 | |
| • #跟帖# If T(2) - T(1) != 1/2, how to prove Lemma1 of AllBrother? [脑筋急转] - wxcfan123(0 bytes ) 2011-10-12 | |
| • #跟帖# Roughly, S(n+1) < 2nS(n) < 2(n+1)S(n) ~ 2(n+1)!. Should be conve [脑筋急转] - wxcfan123(0 bytes ) 2011-10-10 | |
| • #跟帖# Give an example: S(n) = 1/2(S(n-1) + S(n-2)), S(1) = S(2) = 1. [脑筋急转] - wxcfan123(90 bytes ) 2011-10-10 | |
| • #跟帖# 如果没见过这题，能将S(N)解出来，那水平是相当不错的了。 [脑筋急转] - wxcfan123(0 bytes ) 2011-10-10 | |
| • #跟帖# to determine the solution of the system: [脑筋急转] - wxcfan123(296 bytes ) 2011-10-07 | |
| • #跟帖# It should be the same as calculate the ranks of two matrix to d [脑筋急转] - wxcfan123(160 bytes ) 2011-10-07 | |
| • #跟帖# 回复：A52=4 or 7, how do you know it is 4? Guess and try or some lo [脑筋急转] - wxcfan123(0 bytes ) 2011-10-04 | |
| • #跟帖# This one is really hard, altough it is only rated to 3 (highest [脑筋急转] - wxcfan123(249 bytes ) 2011-10-03 | |
| • #跟帖# I know that cell can only be set to 4 or 7, but can not logicall [脑筋急转] - wxcfan123(0 bytes ) 2011-10-03 | |
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