²é¿´: 882  |  »Ø¸´: 6

sunyuanxin

½û³æ (ÖøÃûдÊÖ)

±¾ÌûÄÚÈݱ»ÆÁ±Î

» ²ÂÄãϲ»¶

» ±¾Ö÷ÌâÏà¹Ø¼ÛÖµÌùÍÆ¼ö£¬¶ÔÄúͬÑùÓаïÖú:

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

bych3384

ľ³æ (ÕýʽдÊÖ)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
°ÑÁ½¸öÇóºÍʽ×ÓÕ¹¿ª±È½Ï¾ÍÐÐÀ²£¡
2Â¥2014-04-02 10:11:34
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

sunyuanxin

½û³æ (ÖøÃûдÊÖ)

±¾ÌûÄÚÈݱ»ÆÁ±Î

3Â¥2014-04-02 11:57:35
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

sunyuanxin

½û³æ (ÖøÃûдÊÖ)

±¾ÌûÄÚÈݱ»ÆÁ±Î

4Â¥2014-04-02 11:59:43
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

sunyuanxin

½û³æ (ÖøÃûдÊÖ)

±¾ÌûÄÚÈݱ»ÆÁ±Î

5Â¥2014-04-02 11:59:56
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

bych3384

ľ³æ (ÕýʽдÊÖ)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¸ø³öÒ»¸ö·Ö²¼ÁУ¬ÀûÓÃÊýѧÆÚÍûµÄ¶¨Ò壬¾Í¿ÉÒÔÁË
6Â¥2014-04-03 18:40:42
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

math2000

Ìú¸Ëľ³æ (Ö°Òµ×÷¼Ò)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¡ï ¡ï ¡ï ¡ï ¡ï
¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
sunyuanxin: ½ð±Ò+5, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸, ´óÉñ£¬Äã̫ţÁË¡£ 2014-04-04 13:14:28
ÒòΪNÊÇ·Ç ¸ºÕûÊýÖµËæ»ú±äÁ¿£¬ÔòÓÐ
E(N)= 1*P{N=1}+2*P{N=2}+3*P{N=3}+...+n*P{N=n}+....
       = P{N=1} + P{N=2} + P{N=3} +...+P{N=n}+.........
                      + P{N=2} + P{N=3} +...+P{N=n}+.....
                                    + P{N=3} +....+ P{N=n} +...
                                                  +......

=  P{N>=1}  (ÉÏÃæµÚÒ»ÐÐÏà¼ÓµÄ½á¹û)
      +P{N>=2}  (ÉÏÃæµÚ¶þÐÐÏà¼ÓµÄ½á¹û)
   +   P{N>=3}  (ÉÏÃæµÚÈýÐÐÏà¼ÓµÄ½á¹û)
  + ....+
  +P{N>=n}  (ÉÏÃæµÚnÐÐÏà¼ÓµÄ½á¹û)
+ ...
¼´ÎªÂ¥Ö÷ËùÐèµÄ½á¹û
7Â¥2014-04-03 21:31:37
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
Ïà¹Ø°æ¿éÌø×ª ÎÒÒª¶©ÔÄÂ¥Ö÷ sunyuanxin µÄÖ÷Ìâ¸üÐÂ
×î¾ßÈËÆøÈÈÌûÍÆ¼ö [²é¿´È«²¿] ×÷Õß »Ø/¿´ ×îºó·¢±í
[¿¼ÑÐ] 0703»¯Ñ§µ÷¼Á£¬Çóµ¼Ê¦ÊÕ +7 ÌìÌìºÃÔËÀ´Éϰ¶° 2026-03-24 7/350 2026-03-24 20:26 by peike
[¿¼ÑÐ] 0854µç×ÓÐÅÏ¢Çóµ÷¼Á +6 ¦Á____ 2026-03-22 7/350 2026-03-24 19:46 by sunjie8888
[¿¼ÑÐ] ×ÊÔ´Óë»·¾³ µ÷¼ÁÉêÇë(333·Ö) +7 holy J 2026-03-21 7/350 2026-03-24 17:24 by xiaohai104
[¿¼ÑÐ] 307Çóµ÷¼Á +3 ÓàÒâÇä 2026-03-21 6/300 2026-03-24 15:03 by ÓàÒâÇä
[¿¼ÑÐ] 321Çóµ÷¼Á +4 Ymlll 2026-03-24 4/200 2026-03-24 14:44 by sprinining
[¿¼ÑÐ] Ò»Ö¾Ô¸¹ú¿Æ¹ý³ÌËù081700£¬274Çóµ÷¼Á +3 ÈýË®ÑÐ0Ë®Á¢·½ 2026-03-23 3/150 2026-03-23 23:11 by MajorWen
[¿¼ÑÐ] ²ÄÁÏ/ũҵרҵ£¬07/08¿ªÍ·¾ù¿É£¬¹ýÏß¾ÍÐÐ +3 ºÇßíŶ»í 2026-03-23 4/200 2026-03-23 22:30 by Íô£¡£¿£¡
[¿¼ÑÐ] 327Çóµ÷¼Á +5 prayer13 2026-03-23 5/250 2026-03-23 22:11 by ÐÇ¿ÕÐÇÔÂ
[¿¼ÑÐ] »¯Ñ§308·ÖÇóµ÷¼Á +3 ÄãºÃÃ÷ÌìÄãºÃ 2026-03-23 3/150 2026-03-23 20:11 by macy2011
[¿¼ÑÐ] 333Çóµ÷¼Á +6 87639 2026-03-21 10/500 2026-03-23 10:41 by Iveryant
[¿¼ÑÐ] Ò»Ö¾Ô¸¶«»ª´óѧ»¯Ñ§070300£¬Çóµ÷¼Á +7 2117205181 2026-03-21 8/400 2026-03-22 22:55 by chixmc
[¿¼ÑÐ] 308Çóµ÷¼Á +3 īīĮ 2026-03-21 3/150 2026-03-22 16:54 by i_cooler
[¿¼ÑÐ] ²ÄÁÏ 271Çóµ÷¼Á +5 Õ¹ÐÅÔÃ_ 2026-03-21 5/250 2026-03-21 17:29 by ѧԱ8dgXkO
[¿¼ÑÐ] 0805²ÄÁÏ320Çóµ÷¼Á +3 ÉÎïÓï 2026-03-20 3/150 2026-03-21 15:46 by Î޼ʵIJÝÔ­
[¿¼ÑÐ] 22 350 ±¾¿Æ985Çóµ÷¼Á£¬ÇóÀϵÇÊÕÁô +3 ÀîéóÄÐ003 2026-03-20 3/150 2026-03-21 13:28 by ²«»÷518
[¿¼ÑÐ] 295Çóµ÷¼Á +4 Ò»Ö¾Ô¸¾©Çø211 2026-03-18 6/300 2026-03-20 23:41 by JourneyLucky
[¿¼ÑÐ] 304Çóµ÷¼Á +7 ˾¿Õ. 2026-03-18 7/350 2026-03-20 23:08 by JourneyLucky
[¿¼ÑÐ] Ò»Ö¾Ô¸ Î÷±±´óѧ £¬070300»¯Ñ§Ñ§Ë¶£¬×Ü·Ö287£¬Ë«·ÇÒ»±¾£¬Çóµ÷¼Á¡£ +4 ³¿»èÏßÓëÐǺ£ 2026-03-19 4/200 2026-03-20 22:15 by JourneyLucky
[¿¼ÑÐ] Ò»Ö¾Ô¸Î÷ÄϽ»Í¨ ר˶ ²ÄÁÏ355 ±¾¿ÆË«·Ç Çóµ÷¼Á +5 Î÷ÄϽ»Í¨×¨²Ä355 2026-03-19 5/250 2026-03-20 21:10 by JourneyLucky
[¿¼ÑÐ] Ò»Ö¾Ô¸Î÷°²½»Í¨´óѧ ѧ˶ 354Çóµ÷¼Á211»òÕß˫һÁ÷ +3 ÎÒÏëÒª¶ÁÑо¿Éú 2026-03-20 3/150 2026-03-20 20:13 by JourneyLucky
ÐÅÏ¢Ìáʾ
ÇëÌî´¦ÀíÒâ¼û