Znn3bq.jpeg
²é¿´: 2492  |  »Ø¸´: 2
µ±Ç°Ö»ÏÔʾÂú×ãÖ¸¶¨Ìõ¼þµÄ»ØÌû£¬µã»÷ÕâÀï²é¿´±¾»°ÌâµÄËùÓлØÌû

geoquality

Ìú³æ (³õÈëÎÄ̳)

[ÇóÖú] ÇóÖúÒ»µÀÇúÃæ»ý·Ö£ºx2+y2=1,y2+z2=1,z2+x2=1ËùΧͼÐεıíÃæ»ý

Çó x^2+y^2=1, y^2+z^2=1, z^2+x^2=1ËùΧͼÐεıíÃæ»ý¡£
×îºÃÊǼò½àÒ»µãµÄ·½·¨£¬Ð»Ð»£¡£¡
»Ø¸´´ËÂ¥

» ²ÂÄãϲ»¶

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

geoquality

Ìú³æ (³õÈëÎÄ̳)

ÒýÓûØÌû:
2Â¥: Originally posted by archdevil at 2013-01-09 23:44:46
Ê×ÏÈ£¬¸ù¾Ý¶Ô³ÆÐÔ£¬ÎÒÃÇÖ»ÐèÒª¼ÆËãµÚÒ»ØÔÏÞ²¿·Ö¼´¿É¡£ÔÚµÚÒ»ØÔÏÞÄÚ£¬½«ÇúÃæÏòxoyÃæÍ¶Ó°£¬Í¶Ó°ÇøÓòΪ
x^2+y^2<=1, 0<=x,y<=1;
ÇúÃæ·½³Ì³ÉΪ£ºz=sqrt(1-x^2), µ±x>yʱ£»z=sqrt(1-y^2),µ±x<yʱ¡£¼´½« ...

àÅ£¬Ð»Ð»£¡
²»¹ýÓ¦¸ÃÊÇ24¡Á(2-sqrt(2))¡£
¸ù¾Ý¶Ô³ÆÐÔ£¬Ò»¹²ÓÐ8¡Á3=24¸öÏàͬµÄ¡°µ¥Ôª¡±¡£
3Â¥2013-01-13 00:09:02
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
²é¿´È«²¿ 3 ¸ö»Ø´ð

archdevil

Ìú¸Ëľ³æ (ÕýʽдÊÖ)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
Ê×ÏÈ£¬¸ù¾Ý¶Ô³ÆÐÔ£¬ÎÒÃÇÖ»ÐèÒª¼ÆËãµÚÒ»ØÔÏÞ²¿·Ö¼´¿É¡£ÔÚµÚÒ»ØÔÏÞÄÚ£¬½«ÇúÃæÏòxoyÃæÍ¶Ó°£¬Í¶Ó°ÇøÓòΪ
x^2+y^2<=1, 0<=x,y<=1;
ÇúÃæ·½³Ì³ÉΪ£ºz=sqrt(1-x^2), µ±x>yʱ£»z=sqrt(1-y^2),µ±x ÒÔD2ΪÀý£¬Õⲿ·ÖÃæ»ý=int_0^{sqrt(2)/2}dy int_y^{sqrt(1-y^2)}1/{sqrt(1-x^2)}dx=2-sqrt(2),
×îºóÃæ»ý=16¡Á£¨2-sqrt(2)£©.
ÏÊ»¨ÒòÉú֮ѤÀöøµòл£¬Éºº÷ÒòËÀÖ®¾²Ä¬¶øÓÀºã¡£
2Â¥2013-01-09 23:44:46
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
×î¾ßÈËÆøÈÈÌûÍÆ¼ö [²é¿´È«²¿] ×÷Õß »Ø/¿´ ×îºó·¢±í
[¿¼ÑÐ] 343Çóµ÷¼Á +8 Íõ¹ú˧ 2026-04-10 8/400 2026-04-11 10:50 by qingpingzhu
[¿¼ÑÐ] 295·ÖÇóµ÷¼Á +9 ?ÒªÉϰ¶? 2026-04-10 9/450 2026-04-11 10:48 by qingpingzhu
[¿¼ÑÐ] 283Çóµ÷¼Á +22 ÄǸöàà×Ó 2026-04-09 22/1100 2026-04-11 10:41 by ÄæË®³Ë·ç
[¿¼ÑÐ] µçÆø¹¤³Ìר˶320Çóµ÷¼Á +4 СÂé×Ó111 2026-04-10 4/200 2026-04-11 10:19 by Delta2012
[¿¼ÑÐ] 22408 327·ÖÇóµ÷¼Á +4 ÔÏ·çkon 2026-04-10 4/200 2026-04-11 09:51 by Öí»á·É
[¿¼ÑÐ] Ò»Ö¾Ô¸¶«±±´óѧ¿ØÖƹ¤³Ì085406Êý¶þÓ¢¶þ385£¬Çóµ÷¼Á +8 Ezra_Zhang 2026-04-09 8/400 2026-04-11 09:15 by Öí»á·É
[¿¼ÑÐ] Ò»Ö¾Ô¸»ªÄÏÀí¹¤´óѧ331·Ö²ÄÁÏÇóµ÷¼Á +9 ÌìÏÂww 2026-04-09 9/450 2026-04-10 22:58 by Ftglcn90
[¿¼ÑÐ] 085800 ÄÜÔ´¶¯Á¦Çóµ÷¼Á +6 °¢biu°¡°¡°¡°¡°¡ 2026-04-10 6/300 2026-04-10 15:03 by hemengdong
[¿¼ÑÐ] Ò»Ö¾Ô¸ÖÐÄÏ´óѧÎïÀíѧ£¬Ó¢Ò»66£¬Çóµ÷¼Á +4 ³¤ÑÌì½ì» 2026-04-08 5/250 2026-04-10 10:31 by Ó±¹û¶ù
[¿¼ÑÐ] һ־Ը˫·Ç085400µç×ÓÐÅÏ¢344 Çóµ÷¼Á£¬¶Ô²ÄÁϺͻ¯Ñ§·½ÏòÒ²¸ÐÐËȤ +8 ÎÞÇéµÄСÑò 2026-04-09 9/450 2026-04-10 09:30 by ËÉ»¨¸×1201
[¿¼ÑÐ] 308Çóµ÷¼Á +21 ÌÈÈôÆð·çÁËÄØ 2026-04-05 21/1050 2026-04-10 08:13 by Sammy2
[¿¼ÑÐ] Çóµ÷¼Á +15 ÕÅzic 2026-04-05 16/800 2026-04-10 08:12 by kangsm
[¿¼ÑÐ] ²ÄÁÏ»¯¹¤×Ü·Ö334Çóµ÷¼Á +16 Riot2025 2026-04-08 17/850 2026-04-09 20:19 by maddjdld
[¿¼²©] ²ÄÁÏ·½Ïò¿¼²©£¬ÇóÍÆ¼ö +3 ÑÔÓïaaa 2026-04-05 4/200 2026-04-08 22:22 by nxgogo
[¿¼ÑÐ] Ò»Ö¾Ô¸»ª¶«Àí¹¤085601²ÄÁϹ¤³Ì303·ÖÇóµ÷¼Á +15 a1708 2026-04-06 15/750 2026-04-08 16:23 by luoyongfeng
[¿¼ÑÐ] Ò»Ö¾Ô¸¼ª´ó»¯Ñ§327Çóµ÷¼Á +12 ÍõÍõ°×ʯ 2026-04-06 13/650 2026-04-08 16:05 by luoyongfeng
[¿¼ÑÐ] ²ÄÁÏר˶(0856) 339·ÖÇóµ÷¼Á +16 ¹þ¹þ¹þ¶ì¹þ¹þ¹þ 2026-04-05 16/800 2026-04-08 16:02 by luoyongfeng
[¿¼ÑÐ] »¯Ñ§0703-Ò»Ö¾Ô¸211-338·ÖÇóµ÷¼Á +10 vants 2026-04-05 11/550 2026-04-08 16:02 by screening
[¿¼ÑÐ] 307Çóµ÷¼Á +3 Youth@@ 2026-04-07 3/150 2026-04-07 22:00 by hemengdong
[¿¼ÑÐ] Ò»Ö¾Ô¸Çà¿Æ085500£¬³õÊÔ295·Ö£¬¹«¹²¿Î213·Ö +3 Óöµ½µÄÈËÔ¸Íû¶¼Ä 2026-04-05 3/150 2026-04-05 18:45 by À¶ÔÆË¼Óê
ÐÅÏ¢Ìáʾ
ÇëÌî´¦ÀíÒâ¼û