²é¿´: 1202  |  »Ø¸´: 5

Doran

гæ (³õÈëÎÄ̳)

[ÇóÖú] ¡¾Çó½â¡¿Çë½ÌÊýѧ´óÉñ£¬Õâ¸öÎÊÌâÔõô¼ÆËã ÒÑÓÐ3È˲ÎÓë

¶ÔÓÚÒ»¸ö¸ø¶¨µÄÕý·½ÐÎÇøÓòa*a£¬ÓÃn¸ö°ë¾¶ÎªR(a>>R))µÄÔ²S1,S2,S3¡­..½øÐÐËæ»úÌî³ä£¬Ô²ÓëÔ²Ö®¼ä²»ÄÜÏཻ£¨Ô²µÄÒ»²¿·Ö¿ÉÒÔÔÚÕý·½ÐÎÍ⣬µ«Ô²ÐÄÒªÔÚÕý·½Ð΃ȣ©£¬ ÇónµÄÆÚÍûE£¨n£© »òÕßÇóËùÓÐÔ²¸²¸ÇÕý·½ÐεÄÃæ»ý
Õâ¸öÎÊÌâÓнâûÓÐ?ÓÐûÓдóÉñÖªµÀÔõôËãµÄ
»Ø¸´´ËÂ¥

» ²ÂÄãϲ»¶

» ±¾Ö÷ÌâÏà¹Ø¼ÛÖµÌùÍÆ¼ö£¬¶ÔÄúͬÑùÓаïÖú:

ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

math2000

Ìú¸Ëľ³æ (Ö°Òµ×÷¼Ò)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
¸öÈ˾õµÃÌâÄ¿ÌâÉè´æÔÚì¶Ü£º
Ò»ÊÇÓÃn¸ö°ë¾¶ÎªR(a>>R))µÄÔ²S1,S2,S3¡­..½øÐÐËæ»úÌî³ä£¬
¶þÊÇÔ²ÓëÔ²Ö®¼ä²»ÄÜÏཻ
Èç¹ûÊÇÍêÈ«Ëæ»úµÄ»°£¬¿Ï¶¨ºÜµ¼ÖÂÔ²ÓëÔ²Ïཻ£¬Èç¹ûÒª±£Ö¤Ô²ÓëÔ²²»Ïཻ£¬Ôò¿Ï¶¨²»ÊÇÍêÈ«Ëæ»ú
2Â¥2014-10-02 22:27:51
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

taozhexuan

Òø³æ (³õÈëÎÄ̳)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
Õâ¸öÎÊÌâת»¯³É£¬ÔÚÕý·½ÐÎÄÚËæ»úͶһЩµã£¬Ê¹µÃÿһ¸öµãÖÁÉÙÓÐÒ»¸öÓëÖ®Ïà¾àΪ2rµÄµã£¬ÇÒûÓкÍËüÏà¾àСÓÚ2rµÄµã¡£

[ ·¢×ÔСľ³æ¿Í»§¶Ë ]
ÎÒÃDZØÐëÖªµÀ£¬ÎÒÃDZؽ«ÖªµÀ
3Â¥2014-10-03 05:01:07
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

uvwxmc

½ð³æ (ÕýʽдÊÖ)

ÒýÓûØÌû:
3Â¥: Originally posted by taozhexuan at 2014-10-03 05:01:07
Õâ¸öÎÊÌâת»¯³É£¬ÔÚÕý·½ÐÎÄÚËæ»úͶһЩµã£¬Ê¹µÃÿһ¸öµãÖÁÉÙÓÐÒ»¸öÓëÖ®Ïà¾àΪ2rµÄµã£¬ÇÒûÓкÍËüÏà¾àСÓÚ2rµÄµã¡£

²»Äܹ涨 ¡®Ïà¾à2r¡¯ £¬Ö»ÄÜ˵¾àÀë´óÓÚ2r¡£µÈÓÚ2rµÄ¸ÅÂÊÊÇ0¡£
ÄãûÓÐ˵£¬¡®Ò»Ö±³ÖÐøµ½Ã»ÓкÏÊʵĿտɷÅÐÂÔ²¡¯£¬ËùÒÔÊÇÈ±Ô¼ÊøÌõ¼þµÄ¡£
¼ÙÈçÄãÈÓ1¸öÍ£ÁË£¬»òÕßÈÓ2¸öÍ£ÁË£¬Ë­ÖªµÀÄãµ½µ×ÏëÈÓ¼¸¸öÄØ£¿£¡
4Â¥2014-10-03 13:32:02
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

zaq123321

ר¼Ò¹ËÎÊ (ÖøÃûдÊÖ)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
Thus n Is a discrete random variable. We need to compute P(n equals 1),....,N. Then compute expectation by defination. Here N is a finite number.

[ ·¢×ÔÊÖ»ú°æ http://muchong.com/3g ]
Сľ³æ¸øÎÒÎÂů£¬¸øÎÒÏ£Íû£¬°®¾ÍÒª°®Ð¡Ä¾³æ¡£
5Â¥2014-10-03 19:45:35
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

Doran

гæ (³õÈëÎÄ̳)

ÒýÓûØÌû:
2Â¥: Originally posted by math2000 at 2014-10-02 22:27:51
¸öÈ˾õµÃÌâÄ¿ÌâÉè´æÔÚì¶Ü£º
Ò»ÊÇÓÃn¸ö°ë¾¶ÎªR(a>>R))µÄÔ²S1,S2,S3¡­..½øÐÐËæ»úÌî³ä£¬
¶þÊÇÔ²ÓëÔ²Ö®¼ä²»ÄÜÏཻ
Èç¹ûÊÇÍêÈ«Ëæ»úµÄ»°£¬¿Ï¶¨ºÜµ¼ÖÂÔ²ÓëÔ²Ïཻ£¬Èç¹ûÒª±£Ö¤Ô²ÓëÔ²²»Ïཻ£¬Ôò¿Ï¶¨²»ÊÇÍêÈ«Ëæ»ú

Õâ¸ö¹ý³ÌÊÇ£ºÔÚÕý·½ÐÎËæ»ú·ÅÒ»¸öÔ²£¬½Ó×ÅËæ»ú·ÅµÚ¶þÔ²£¬È»ºóÒ»Ö±³ÖÐøµ½Ã»ÓкÏÊʵĿտɷÅÐÂÔ²£¬Ô²Ô²Ö®¼ä²»ÄÜÏཻ£¬ÇóÔ²¸öÊýµÄÆÚÍû
6Â¥2014-10-03 22:48:04
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
Ïà¹Ø°æ¿éÌø×ª ÎÒÒª¶©ÔÄÂ¥Ö÷ Doran µÄÖ÷Ìâ¸üÐÂ
×î¾ßÈËÆøÈÈÌûÍÆ¼ö [²é¿´È«²¿] ×÷Õß »Ø/¿´ ×îºó·¢±í
[¿¼ÑÐ] 333Çóµ÷¼Á +3 ÎÄ˼¿Í 2026-03-16 7/350 2026-03-16 18:21 by ÎÄ˼¿Í
[¿¼ÑÐ] Áº³ÉΰÀÏʦ¿ÎÌâ×é»¶Ó­ÄãµÄ¼ÓÈë +8 һѼѼӴ 2026-03-14 9/450 2026-03-16 17:35 by ãåÁØ12138
[¿¼ÑÐ] »·¾³¹¤³Ìµ÷¼Á +6 ´ó¿Édigkids 2026-03-16 6/300 2026-03-16 17:16 by barlinike
[¿¼ÑÐ] 0703»¯Ñ§µ÷¼Á£¬Çó¸÷λÀÏʦÊÕÁô +8 ÇïÓÐľ±± 2026-03-14 8/400 2026-03-16 15:21 by ŶŶ123
[¿¼ÑÐ] 0703 ÎïÀí»¯Ñ§µ÷¼Á +3 ÎÒ¿ÉÒÔÉϰ¶µÄ¶Ô 2026-03-13 5/250 2026-03-16 10:50 by ÎÒ¿ÉÒÔÉϰ¶µÄ¶ÔÂ
[¿¼ÑÐ] 311Çóµ÷¼Á +6 ¶¬Ê®Èý 2026-03-15 6/300 2026-03-16 08:00 by wang_dand
[¿¼ÑÐ] ÇóÀÏʦÊÕÁôµ÷¼Á +4 jiang½ª66 2026-03-14 5/250 2026-03-15 20:11 by Winj1e
[¿¼²©] »¶Ó­É격ͬѧÁªÏµ +3 ÌìµÀ³êÇÚ2026686 2026-03-10 7/350 2026-03-15 19:03 by ÌìµÀ³êÇÚ2026686
[¿¼ÑÐ] 265Çóµ÷¼Á +4 Íþ»¯±ý07 2026-03-12 4/200 2026-03-14 17:23 by userper
[¿¼ÑÐ] 271Çóµ÷¼Á +10 ÉúÈçÏÄ»¨¡­ 2026-03-11 10/500 2026-03-14 00:35 by Âô±¨Ô±Ð¡Óê
[¿¼ÑÐ] 2026¿¼Ñе÷¼Á+±¾¿ÆÑӱߴóѧ+ɽ¶«´óѧ+ÉúÎﻯѧÓë·Ö×ÓÉúÎïѧ+ÓÐÏîÄ¿¾­Ñé +3 ccdsscjy 2026-03-10 3/150 2026-03-14 00:12 by JourneyLucky
[¿¼ÑÐ] 341Çóµ÷¼Á +3 ·¬ÇÑÍ·--- 2026-03-10 3/150 2026-03-13 23:07 by JourneyLucky
[¿¼ÑÐ] 308Çóµ÷¼Á +5 ÊÇLupa°¡ 2026-03-11 5/250 2026-03-13 22:13 by JourneyLucky
[¿¼ÑÐ] £¨081700£©»¯Ñ§¹¤³ÌÓë¼¼Êõ-298·ÖÇóµ÷¼Á +12 11À²À²À² 2026-03-11 35/1750 2026-03-13 21:25 by JourneyLucky
[¿¼ÑÐ] Çóµ÷¼Á +7 18880831720 2026-03-11 7/350 2026-03-13 16:10 by JourneyLucky
[¿¼ÑÐ] 26¿¼ÑÐÇóµ÷¼Á +5 ؼºêSir 2026-03-13 5/250 2026-03-13 13:05 by JourneyLucky
[¿¼ÑÐ] 296Çóµ÷¼Á +3 ´ó¿Ú³Ô·¹ ÉíÌ彡 2026-03-13 3/150 2026-03-13 10:31 by ѧԱ8dgXkO
[¿¼²©] 2026Ä격ʿÉêÇë +3 QwQwQW10 2026-03-11 3/150 2026-03-12 17:58 by gxch43
[¿¼ÑÐ] 085600 ²ÄÁÏÓ뻯¹¤ 295 Çóµ÷¼Á +10 dream¡­¡­ 2026-03-10 12/600 2026-03-12 13:46 by dream¡­¡­
[¿¼ÑÐ] 0703»¯Ñ§µ÷¼Á +3 Èýdd. 2026-03-10 3/150 2026-03-10 15:45 by peike
ÐÅÏ¢Ìáʾ
ÇëÌî´¦ÀíÒâ¼û