±±¾©Ê¯ÓÍ»¯¹¤Ñ§Ôº2026ÄêÑо¿ÉúÕÐÉú½ÓÊÕµ÷¼Á¹«¸æ
²é¿´: 3105  |  »Ø¸´: 20
µ±Ç°Ö»ÏÔʾÂú×ãÖ¸¶¨Ìõ¼þµÄ»ØÌû£¬µã»÷ÕâÀï²é¿´±¾»°ÌâµÄËùÓлØÌû

Edstrayer

°æÖ÷ (ÖøÃûдÊÖ)

·½´ç¶·ÊÒСÌìµØÕýÆøÃÔÂþ´óÊÀ½ç

[½»Á÷] Ò»µÀÆ½Ãæ¼¸ºÎµÄϰÌâ ÒÑÓÐ9È˲ÎÓë

ÌâÄ¿£ºÈçͼËùʾ£¬ÉèKÊÇÕýn±ßÐΣ¬OÊÇKµÄÍâ½ÓÔ²µÄÔ²ÐÄ£¬PQºÍQRÊÇKµÄÏàÁÚµÄÁ½±ß£¬AÊÇPQµÄÖе㣬BÊÇ´¹Ö±ÓÚQRµÄÔ²OµÄ°ë¾¶OCµÄÖе㡣ÊÔ¼ÆËã
Hint£ºÓú¬nµÄ´úÊýʽ±íʾ¡£

Ò»µÀÆ½Ãæ¼¸ºÎµÄϰÌâ
²¶»ñ.png
»Ø¸´´ËÂ¥

» ÊÕ¼±¾ÌûµÄÌÔÌûר¼­ÍƼö

´óѧÊýѧϰÌâ»ã¿¯×¨¼­

» ²ÂÄãϲ»¶

Çà´ÐËêÔÂÊ¥µ®Ò¹£¬ÀËÂþ¸èÎèÓ­ÐÂÄê¡£
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

Edstrayer

°æÖ÷ (ÖøÃûдÊÖ)

·½´ç¶·ÊÒСÌìµØÕýÆøÃÔÂþ´óÊÀ½ç

ÒýÓûØÌû:
3Â¥: Originally posted by liuqh at 2016-08-03 08:07:50
ÉèÔ²°ë¾¶Îª1£¬Èý½ÇÐÎOABÖУ¬OA=cos(90/n),OB=1/2,½ÇAOB=180/n,ÔËÓÃÕýÏÒ¶¨ÀíµÃ½ÇOAB£¬½ÇABC=½ÇAOB£«½ÇOAB

ÓÃÕýÏÒ¶¨ÀíµÃµ½µÄ½á¹ûÏà¶Ô¼òµ¥Ò»Ð©
Çà´ÐËêÔÂÊ¥µ®Ò¹£¬ÀËÂþ¸èÎèÓ­ÐÂÄê¡£
5Â¥2016-08-03 23:37:57
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
²é¿´È«²¿ 21 ¸ö»Ø´ð

iάÊý

ľ³æ (ÕýʽдÊÖ)

¡ï ¡ï ¡ï
Сľ³æ: ½ð±Ò+0.5, ¸ø¸öºì°ü£¬Ð»Ð»»ØÌû
Edstrayer: ½ð±Ò+2 2016-08-03 02:40:32
˵һÏÂ˼·£ºÏȽ¨Ïµ£¬O(0,0),R(r,0),Q(r*cos(2pi/n),r*sin(2pi/n)),P(r*cos(4pi/n),r*sin(4pi/n)).ÒòΪAΪPQµÄÖе㣬ËùÒÔA×ø±ê¿ÉÒÔÇó³ö.ÓÖC(r*cos(pi/n),r*sin(pi/n)),BΪOCÖе㣬ËùÒÔB×ø±êÒ²¿ÉÒÔÇó³ö¡£ËùÒÔAB,BC,CAµÄ³¤¶È¾ùÒÑÖª£¬ÓÉÓàÏÒ¶¨Àí¿ÉÒÔÇó³öcos¡ÏABCµÄÖµ£¬´Ó¶øÇó³ö¡ÏABC¡£
2Â¥2016-08-03 00:57:31
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

liuqh

Ìú¸Ëľ³æ (ÕýʽдÊÖ)

¡ï ¡ï ¡ï
Сľ³æ: ½ð±Ò+0.5, ¸ø¸öºì°ü£¬Ð»Ð»»ØÌû
Edstrayer: ½ð±Ò+2 2016-08-03 10:09:22
ÉèÔ²°ë¾¶Îª1£¬Èý½ÇÐÎOABÖУ¬OA=cos(90/n),OB=1/2,½ÇAOB=180/n,ÔËÓÃÕýÏÒ¶¨ÀíµÃ½ÇOAB£¬½ÇABC=½ÇAOB£«½ÇOAB
3Â¥2016-08-03 08:07:50
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

Edstrayer

°æÖ÷ (ÖøÃûдÊÖ)

·½´ç¶·ÊÒСÌìµØÕýÆøÃÔÂþ´óÊÀ½ç

ÒýÓûØÌû:
2Â¥: Originally posted by iάÊý at 2016-08-03 00:57:31
˵һÏÂ˼·£ºÏȽ¨Ïµ£¬O(0,0),R(r,0),Q(r*cos(2pi/n),r*sin(2pi/n)),P(r*cos(4pi/n),r*sin(4pi/n)).ÒòΪAΪPQµÄÖе㣬ËùÒÔA×ø±ê¿ÉÒÔÇó³ö.ÓÖC(r*cos(pi/n),r*sin(pi/n)),BΪOCÖе㣬ËùÒÔB×ø±êÒ²¿ÉÒÔÇó³ö¡£ËùÒÔAB,BC,C ...

½âÎö·¨¿ÉÒÔËã³ö½á¹û£¬µ«ÊÇÖмäµÄÓàÏÒ¶¨ÀíµÄÓ¦Óã¬Öмä½á¹ûµÄ»¯¼ò±È½Ï¸´ÔÓ
Çà´ÐËêÔÂÊ¥µ®Ò¹£¬ÀËÂþ¸èÎèÓ­ÐÂÄê¡£
4Â¥2016-08-03 23:37:13
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
×î¾ßÈËÆøÈÈÌûÍÆ¼ö [²é¿´È«²¿] ×÷Õß »Ø/¿´ ×îºó·¢±í
[¿¼ÑÐ] Çóµ÷¼Á +7 ÕÅzz111 2026-03-27 8/400 2026-03-28 01:00 by ·ÉÐÐÈÕ¼ÇÎ÷
[¿¼ÑÐ] 070300»¯Ñ§Çóµ÷¼Á +4 Æð¸öÃûÕ¦ÕâôÄÑ 2026-03-27 4/200 2026-03-27 21:39 by 83503ËïÀÏʦ
[¿¼ÑÐ] 289Çóµ÷¼Á +7 ÐÂʱ´ú²ÄÁÏ 2026-03-27 7/350 2026-03-27 18:08 by arrow8852
[¿¼ÑÐ] 266Çóµ÷¼Á +11 ÑôÑôÍÛÈû 2026-03-27 12/600 2026-03-27 17:56 by yu221
[¿¼²©] 26É격 +3 ¼ÓÓͳ尡£¡ 2026-03-26 3/150 2026-03-27 15:38 by cls512
[¿¼ÑÐ] ²ÄÁÏÓ뻯¹¤£¨0856£©304ÇóBÇøµ÷¼Á +7 Çñgl 2026-03-27 7/350 2026-03-27 15:27 by JoeÂÊ
[¿¼ÑÐ] Ò»Ö¾Ô¸±±»¯085600²ÄÁÏר˶275|ÓÐÎÄÕÂרÀû£üÇóµ÷¼Á +3 Micky11223 2026-03-25 3/150 2026-03-27 14:52 by ×íÔÚ·çÀï
[¿¼ÑÐ] 308Çóµ÷¼Á +7 īīĮ 2026-03-25 7/350 2026-03-27 14:47 by ¿ñìÅÂóµ±µ±
[¿¼ÑÐ] 317Çóµ÷¼Á +5 Ê®ÏÐwx 2026-03-24 5/250 2026-03-27 13:48 by ÑîÑîÑî×Ï
[¿¼ÑÐ] Ò»Ö¾Ô¸±±¾©»¯¹¤´óѧ²ÄÁÏÓ뻯¹¤ 264·Ö¸÷¿Æ¹ýAÇø¹ú¼ÒÏß +10 ¹þ¹þ157349 2026-03-21 10/500 2026-03-27 13:06 by zzll406
[¿¼ÑÐ] 304Çóµ÷¼Á +3 ÂüÊâ2266 2026-03-27 3/150 2026-03-27 10:17 by guoweigw
[¿¼ÑÐ] Ò»Ö¾Ô¸Î人Àí¹¤£¬×Ü·Ö321£¬Ó¢Ò»Êý¶þ£¬ÇóÀÏʦÊÕÁô¡£ +5 nnnnnnn5 2026-03-25 5/250 2026-03-27 04:42 by wxiongid
[¿¼ÑÐ] 321Çóµ÷¼Á +6 wasdssaa 2026-03-26 6/300 2026-03-26 20:57 by sanrepian
[¿¼ÑÐ] Çóµ÷¼Á +3 ÀîÀî²»·þÊä 2026-03-25 3/150 2026-03-25 13:03 by cmz0325
[¿¼ÑÐ] ²ÄÁÏ¿¼Ñе÷¼ÁÉú +3 »ÆÁ»Ò»ÃÎǧÄê 2026-03-24 3/150 2026-03-24 17:00 by barlinike
[¿¼ÑÐ] 292Çóµ÷¼Á +4 ¶ì¶ì¶ì¶î¶î¶î¶î¶ 2026-03-24 4/200 2026-03-24 16:41 by peike
[¿¼ÑÐ] Çóµ÷¼Á +7 Ê®Èý¼ÓÓÍ 2026-03-21 7/350 2026-03-23 23:48 by ÈÈÇéɳĮ
[¿¼ÑÐ] 070300£¬Ò»Ö¾Ô¸±±º½320Çóµ÷¼Á +3 Jerry0216 2026-03-22 5/250 2026-03-23 09:16 by ¡£¡£ÌÃÌÃ
[¿¼ÑÐ] Ò»Ö¾Ô¸»ªÖпƼ¼´óѧ071000£¬Çóµ÷¼Á +4 ÑØ°¶Óб´¿Ç6 2026-03-21 4/200 2026-03-22 07:21 by ilovexiaobin
[¿¼ÑÐ] ²ÄÁÏÓ뻯¹¤£¨0856£©304Çó BÇø µ÷¼Á +3 Çñgl 2026-03-21 3/150 2026-03-21 13:47 by lature00
ÐÅÏ¢Ìáʾ
ÇëÌî´¦ÀíÒâ¼û