http://cn.engadget.com/2007/07/28/math-challenge-captcha/ Engadget 中国版 Comments for 数学要好好学，不然以后就不能留言了喔！ http://cn.engadget.com/media/feedlogo.gif http://cn.engadget.com en-us Copyright 2009 Weblogs, Inc. The contents of this feed are available for non-commercial use only. Blogsmith http://www.blogsmith.com/http://cn.engadget.com/2007/07/28/math-challenge-captcha/http://cn.engadget.com/2007/07/28/math-challenge-captcha/Jul 28th 2007 6:26AMhttp://cn.engadget.com/2007/07/28/math-challenge-captcha/http://cn.engadget.com/2007/07/28/math-challenge-captcha/Jul 28th 2007 11:10AMhttp://cn.engadget.com/2007/07/28/math-challenge-captcha/http://cn.engadget.com/2007/07/28/math-challenge-captcha/Jul 28th 2007 9:01AMhttp://cn.engadget.com/2007/07/28/math-challenge-captcha/http://cn.engadget.com/2007/07/28/math-challenge-captcha/Jul 28th 2007 9:34AMhttp://cn.engadget.com/2007/07/28/math-challenge-captcha/http://cn.engadget.com/2007/07/28/math-challenge-captcha/Jul 28th 2007 10:10AMhttp://cn.engadget.com/2007/07/28/math-challenge-captcha/http://cn.engadget.com/2007/07/28/math-challenge-captcha/负的π分之三]]>Jul 28th 2007 10:10AMhttp://cn.engadget.com/2007/07/28/math-challenge-captcha/http://cn.engadget.com/2007/07/28/math-challenge-captcha/Jul 28th 2007 12:43PMhttp://cn.engadget.com/2007/07/28/math-challenge-captcha/http://cn.engadget.com/2007/07/28/math-challenge-captcha/4吧]]>Aug 1st 2007 7:12AMhttp://cn.engadget.com/2007/07/28/math-challenge-captcha/http://cn.engadget.com/2007/07/28/math-challenge-captcha/
呵呵,不会做的朋友都不是人了咯. 打击面好大,怕怕.]]>Apr 16th 2008 1:40PMhttp://cn.engadget.com/2007/07/28/math-challenge-captcha/http://cn.engadget.com/2007/07/28/math-challenge-captcha/
http://img262.imageshack.us/img262/2792/aaaot0.jpg]]>Jul 28th 2007 8:26PMhttp://cn.engadget.com/2007/07/28/math-challenge-captcha/http://cn.engadget.com/2007/07/28/math-challenge-captcha/4吧

效果就是直接求导。没什么啊


这个还好我会,不过不知道π是带字母还是带具体值啊？还有最后保留几位有效数字啊？


显然事字母。。要不不好做]]>Jul 28th 2007 10:23PMhttp://cn.engadget.com/2007/07/28/math-challenge-captcha/http://cn.engadget.com/2007/07/28/math-challenge-captcha/Jul 29th 2007 11:29AMhttp://cn.engadget.com/2007/07/28/math-challenge-captcha/http://cn.engadget.com/2007/07/28/math-challenge-captcha/这比那个

lim ln{2 + √¯[arctan x · sin(1/x)]}
x → 0

的还是简单不少了~
前些天刚看杂志上写的，还是个中文的论坛。不过杂志上没给网址……]]>Jul 29th 2007 1:23PMhttp://cn.engadget.com/2007/07/28/math-challenge-captcha/http://cn.engadget.com/2007/07/28/math-challenge-captcha/Jul 29th 2007 9:37PM