Znn3bq.jpeg
ÉÇÍ·´óѧº£Ñó¿ÆÑ§½ÓÊܵ÷¼Á
²é¿´: 15138  |  »Ø¸´: 8
µ±Ç°Ö»ÏÔʾÂú×ãÖ¸¶¨Ìõ¼þµÄ»ØÌû£¬µã»÷ÕâÀï²é¿´±¾»°ÌâµÄËùÓлØÌû

wangyuhui8538

½ð³æ (СÓÐÃûÆø)

[½»Á÷] ¡¾ÇóÖú¡¿ÈçºÎÇóE(X^2)£¿ ÒÑÓÐ6È˲ÎÓë

ÉèÈôËæ»ú±äÁ¿·þ´Ó±ê×¼Õý̬·Ö²¼X~N(0,1)£¬ÄÇôXµÄƽ·½µÄÆÚÍûE(X^2)ºÍ·½²îVar(X^2)ÈçºÎÇó£¿
ÁíÍâÒ»¸öÎÊÌ⣬Èç¹ûXÊÇάÄɹý³Ì£¬¼´X(t)~N(0,t)£¬ÄÇôX¶ÔtµÄ»ý·ÖÊÇ·ñÒ²ÊÇάÄɹý³Ì£¿

[ Last edited by wangyuhui8538 on 2010-7-28 at 14:01 ]
»Ø¸´´ËÂ¥

» ²ÂÄãϲ»¶

» ±¾Ö÷ÌâÏà¹Ø¼ÛÖµÌùÍÆ¼ö£¬¶ÔÄúͬÑùÓаïÖú:

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

redboy6888

Òø³æ (СÓÐÃûÆø)

¡ï ¡ï
Сľ³æ(½ð±Ò+0.5):¸ø¸öºì°ü£¬Ð»Ð»»ØÌû½»Á÷
javeey(½ð±Ò+1):¹ÄÀøÐ³æ²ÎÓë½»Á÷ 2010-07-29 18:22:49
E(X)=0,D(X)=1,E(X^2)=D(X)+E(X)^2=1
7Â¥2010-07-29 18:09:09
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
²é¿´È«²¿ 9 ¸ö»Ø´ð

xxppyy

ľ³æ (СÓÐÃûÆø)

¡ï ¡ï
Сľ³æ(½ð±Ò+0.5):¸ø¸öºì°ü£¬Ð»Ð»»ØÌû½»Á÷
javeey(½ð±Ò+1):ллÌṩ½â´ð 2010-07-27 19:16:36
¢Ù E(X^2)=D(X)+(EX)^2
2Â¥2010-07-27 17:54:04
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

xxppyy

ľ³æ (СÓÐÃûÆø)

¡ï ¡ï ¡ï
Сľ³æ(½ð±Ò+0.5):¸ø¸öºì°ü£¬Ð»Ð»»ØÌû½»Á÷
javeey(½ð±Ò+2):ллÌṩ°ïÖú 2010-07-28 07:28:26
¢Ú
3Â¥2010-07-27 23:11:54
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

wangyuhui8538

½ð³æ (СÓÐÃûÆø)

javeey:¿Éͨ¹ýµã»÷´ð°¸ÌûÏ·½µÄ¡°ÒýÓûظ´¸ÃÌû¡°µÄ·½Ê½½øÐлظ´£¬ÕâÑù¶Ô·½»áÊÕµ½ÌáʾÐÅÏ¢¡£ 2010-07-28 16:57:22
ллxxppyy µÄ°ïÖú£¬ÁíÍâÎÊһϣ¬·½²îÔËËãºÍ»ý·ÖÔËËãÊÇ·ñ¿ÉÒÔ»¥»»´ÎÐò£¿£¨ÊýѧÆÚÍûÔËËã¿ÉÒԺͻý·ÖÔËË㻥»»´ÎÐò£¬¼´»ý·ÖµÄÆÚÍûµÈÓÚÆÚÍûµÄ»ý·Ö£©
4Â¥2010-07-28 16:26:51
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
×î¾ßÈËÆøÈÈÌûÍÆ¼ö [²é¿´È«²¿] ×÷Õß »Ø/¿´ ×îºó·¢±í
[¿¼ÑÐ] 085404 22408 309·ÖÇóµ÷¼Á +8 lzmk 2026-04-14 9/450 2026-04-15 13:23 by ºÚ¿Æ¼¼¿óÒµ
[¿¼ÑÐ] 273Çóµ÷¼Á +5 °×¾Ó²»Ò×. 2026-04-09 7/350 2026-04-15 13:16 by Î÷±±Íû¡ª·çɳ
[¿¼ÑÐ] µ÷¼ÁÇóÊÕÁô +34 ¹ûÈ»ÓÐÎÒ 2026-04-10 35/1750 2026-04-15 13:05 by Î÷±±Íû¡ª·çɳ
[¿¼ÑÐ] ²ÄÁϹ¤³Ì281»¹Óе÷¼Á»ú»áÂð +43 xaw. 2026-04-11 44/2200 2026-04-15 12:46 by Î÷±±Íû¡ª·çɳ
[¿¼ÑÐ] ͨÐŹ¤³ÌÇóµ÷¼Á£¡£¡£¡ +4 zlb770521 2026-04-14 4/200 2026-04-14 18:19 by lbsjt
[¿¼ÑÐ] ʳƷÓëÓªÑø£¨0955£©271Çóµ÷¼Á +15 Éý¸ñ°¢´ï 2026-04-12 16/800 2026-04-14 13:18 by ¸¡Èô_°²Éú
[¿¼ÑÐ] Çóµ÷¼Á +3 ÎÒ°®¸ßÊý¸ßÊý°®Î 2026-04-12 3/150 2026-04-14 01:00 by Íõ¬Bè±
[¿¼ÑÐ] Ò»Ö¾Ô¸»ªÄÏÀí¹¤´óѧ331·Ö²ÄÁÏÇóµ÷¼Á +10 ÌìÏÂww 2026-04-09 11/550 2026-04-13 23:25 by pies112
[¿¼ÑÐ] 291Çóµ÷¼Á +8 ¹ØÒä±±. 2026-04-11 8/400 2026-04-12 09:32 by ÄæË®³Ë·ç
[¿¼ÑÐ] Ò»Ö¾Ô¸Ö£ÖÝ´óѧ 22408 305·ÖÇóµ÷¼Á +5 °²Ð¡Âúzzz 2026-04-08 5/250 2026-04-12 00:41 by À¶ÔÆË¼Óê
[¿¼ÑÐ] 0860004 Çóµ÷¼Á 309·Ö +9 Yin DY 2026-04-08 9/450 2026-04-11 22:55 by dongdian1
[¿¼ÑÐ] 070300»¯Ñ§279Çóµ÷¼Á +19 ¹þ¹þ¹þ^_^ 2026-04-08 20/1000 2026-04-11 20:43 by stoner78
[¿¼ÑÐ] 085400 328·Ö Çóµ÷¼Á +10 ιÄãÒ»¸ö´ó³È×Ó 2026-04-09 14/700 2026-04-11 19:53 by lqspecial
[¿¼ÑÐ] 309Çóµ÷¼Á +14 wdhw 2026-04-10 15/750 2026-04-10 21:06 by zhouxiaoyu
[¿¼ÑÐ] 0858Çóµ÷¼Á 5+5 Gky09300550£¬ 2026-04-10 8/400 2026-04-10 19:13 by chemisry
[¿¼ÑÐ] µ÷¼ÁÉêÇë086000Ò»Ö¾Ô¸Î÷±±Å©ÁֿƼ¼´óѧÉúÎïÓëÒ½Ò©320·Ö-±¾¿ÆÆë³¹¤Òµ´óѧ +3 ÃÀÃÀŮʿ 2026-04-09 3/150 2026-04-10 10:31 by liuhuiying09
[¿¼ÑÐ] 292Çóµ÷¼Á +9 ЦЦԬ 2026-04-09 9/450 2026-04-10 10:05 by LHGeng
[¿¼ÑÐ] ²ÄÁÏ»¯¹¤×Ü·Ö334Çóµ÷¼Á +16 Riot2025 2026-04-08 17/850 2026-04-09 20:19 by maddjdld
[¿¼ÑÐ] Çóµ÷¼Á +3 ÖíÈâ¶Õ·ÛÌõcc 2026-04-08 4/200 2026-04-09 10:05 by ÖíÈâ¶Õ·ÛÌõcc
[¿¼ÑÐ] 334Çóµ÷¼Á +16 Riot2025 2026-04-08 17/850 2026-04-09 09:28 by wdyheheeh
ÐÅÏ¢Ìáʾ
ÇëÌî´¦ÀíÒâ¼û