²é¿´: 994  |  »Ø¸´: 5
µ±Ç°Ö»ÏÔʾÂú×ãÖ¸¶¨Ìõ¼þµÄ»ØÌû£¬µã»÷ÕâÀï²é¿´±¾»°ÌâµÄËùÓлØÌû

ÂäÒ¶ÎÞÉù===

ľ³æ (ÕýʽдÊÖ)

Dragonborn

[ÇóÖú] ÇóÖúÊýѧ֤Ã÷Ìâ

ÇóÖ¤: n*(1-x^2)*x^(2n)-(2x+x^2)*(1-x^2n)+2x*(1+x)*(1-x^n)ºã´óÓÚ0£¬ÆäÖÐ0<x<1,nΪ´óÓÚ2µÄÕûÊý¡£Çó´óÉñÖ¸½Ì£¡²»Ê¤¸Ð¼¤£¡ÓÉÓÚÊÖ»ú´«²»ÁËͼ£¬Ö»ÄÜÊÖ´ò¡£

[ ·¢×ÔÊÖ»ú°æ http://muchong.com/3g ]
»Ø¸´´ËÂ¥

» ²ÂÄãϲ»¶

» ±¾Ö÷ÌâÏà¹Ø¼ÛÖµÌùÍÆ¼ö£¬¶ÔÄúͬÑùÓаïÖú:

for you, a thousand times over
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

ÂäÒ¶ÎÞÉù===

ľ³æ (ÕýʽдÊÖ)

Dragonborn

ÒýÓûØÌû:
2Â¥: Originally posted by zaq123321 at 2015-03-24 15:56:57
Replace the second x^(2n) with x^n. Combine the second term and third term. Then each term is positive.

Ìæ»»ºóʽ×Ó±»·Å´óÁ˰ɡ­¡­Òª·ÅËõµÄ»°Ó¦¸ÃÒª·ÅС¡­¡­²»¹ý»¹ÊǸÐл£¡

[ ·¢×ÔСľ³æ¿Í»§¶Ë ]
for you, a thousand times over
3Â¥2015-03-24 18:00:34
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
²é¿´È«²¿ 6 ¸ö»Ø´ð

zaq123321

ר¼Ò¹ËÎÊ (ÖøÃûдÊÖ)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï
¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
ÂäÒ¶ÎÞÉù===: ½ð±Ò+10, ¡ïÓаïÖú, ·Ç³£Ð»Ð»ÄãÄܹØ×¢Õâ¸öÎÊÌ⣡ 2015-03-26 01:42:30
Replace the second x^(2n) with x^n. Combine the second term and third term. Then each term is positive.
Сľ³æ¸øÎÒÎÂů£¬¸øÎÒÏ£Íû£¬°®¾ÍÒª°®Ð¡Ä¾³æ¡£
2Â¥2015-03-24 15:56:57
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

zaq123321

ר¼Ò¹ËÎÊ (ÖøÃûдÊÖ)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

ÒýÓûØÌû:
3Â¥: Originally posted by ÂäÒ¶ÎÞÉù=== at 2015-03-24 18:00:34
Ìæ»»ºóʽ×Ó±»·Å´óÁ˰ɡ­¡­Òª·ÅËõµÄ»°Ó¦¸ÃÒª·ÅС¡­¡­²»¹ý»¹ÊǸÐл£¡
...

Sorry about this. Then should we compute the second derivative, which is negative in (0,1)?
But the calculation looks pretty complex.
Сľ³æ¸øÎÒÎÂů£¬¸øÎÒÏ£Íû£¬°®¾ÍÒª°®Ð¡Ä¾³æ¡£
4Â¥2015-03-24 19:48:30
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

ÂäÒ¶ÎÞÉù===

ľ³æ (ÕýʽдÊÖ)

Dragonborn

ÒýÓûØÌû:
4Â¥: Originally posted by zaq123321 at 2015-03-24 19:48:30
Sorry about this. Then should we compute the second derivative, which is negative in (0,1)?
But the calculation looks pretty complex....

Çóµ¼Ò²Ëã¹ý£¬µ«ÊÇÌ«¸´ÔÓÁË£¬Ò²Åжϲ»³öʽ×Óµ¥µ÷ÐÔ¡£Òòʽ·Ö½â³¢ÊÔ·Ö½âÁËһϣ¬µ«ÊÇûÓнøÒ»²½½øÕ¹
for you, a thousand times over
5Â¥2015-03-24 20:38:37
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
×î¾ßÈËÆøÈÈÌûÍÆ¼ö [²é¿´È«²¿] ×÷Õß »Ø/¿´ ×îºó·¢±í
[¿¼ÑÐ] 0703»¯Ñ§336·ÖÇóµ÷¼Á +6 zbzihdhd 2026-03-15 7/350 2026-03-18 09:53 by zhukairuo
[¿¼ÑÐ] 293Çóµ÷¼Á +11 zjlµÄºÅ 2026-03-16 16/800 2026-03-18 08:10 by zhukairuo
[¿¼ÑÐ] 302Çóµ÷¼Á +9 ¸ºÐÄÕßµ±Öï 2026-03-11 9/450 2026-03-17 17:13 by ruiyingmiao
[¿¼ÑÐ] Ò»Ö¾Ô¸ÄϾ©´óѧ£¬080500²ÄÁÏ¿ÆÑ§Ó빤³Ì£¬µ÷¼Á +4 Jy? 2026-03-16 4/200 2026-03-17 11:02 by gaoqiong
[¿¼ÑÐ] Ò»Ö¾Ô¸211 0703·½Ïò310·ÖÇóµ÷¼Á +3 ŬÁ¦·Ü¶·112 2026-03-15 3/150 2026-03-16 16:44 by houyaoxu
[¿¼ÑÐ] 321Çóµ÷¼Á +5 ´óÃ×·¹£¡ 2026-03-15 5/250 2026-03-16 16:33 by houyaoxu
[¿¼ÑÐ] 0703Ò»Ö¾Ô¸211 285·ÖÇóµ÷¼Á +5 ly3471z 2026-03-13 5/250 2026-03-16 16:16 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] Ò»Ö¾Ô¸¹þ¹¤´ó²ÄÁÏ324·ÖÇóµ÷¼Á +5 ãÆÐñ¶« 2026-03-14 5/250 2026-03-14 14:53 by ľ¹Ï¸à
[¿¼ÑÐ] ²ÄÁÏ080500µ÷¼ÁÇóÊÕÁô +3 Ò»¿Åmeteor 2026-03-13 3/150 2026-03-14 10:54 by peike
[¿¼ÑÐ] ¹¤¿Æ£¬Çóµ÷¼Á +3 ÎÒ887 2026-03-11 3/150 2026-03-13 21:39 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] 301Çóµ÷¼Á +6 Liyouyumairs 2026-03-11 6/300 2026-03-13 20:11 by JourneyLucky
[¿¼ÑÐ] ²ÄÁϹ¤³Ìµ÷¼Á +4 ßäßä¿Õ¿Õ 2026-03-11 4/200 2026-03-13 19:57 by JourneyLucky
[¿¼ÑÐ] 307Çóµ÷¼Á +5 ³¬¼¶ÒÁ°º´óÍõ 2026-03-12 5/250 2026-03-13 15:56 by °ô°ôÇòÊÖ
[¿¼ÑÐ] ¹¤¿Æµ÷¼Á +4 Jiang191123£¡ 2026-03-11 4/200 2026-03-13 15:15 by Miko19
[¿¼ÑÐ] Çóµ÷¼Á +3 ³ÌÓ꺼 2026-03-12 3/150 2026-03-13 15:06 by JourneyLucky
[¿¼ÑÐ] 289Çóµ÷¼Á +3 ÀîÕþÓ¨ 2026-03-12 3/150 2026-03-13 11:02 by Çóµ÷¼Ázz
[¿¼ÑÐ] 070303Ò»Ö¾Ô¸Î÷±±´óѧѧ˶310ÕÒµ÷¼Á +3 dÈçÔ¸Éϰ¶ 2026-03-13 3/150 2026-03-13 10:43 by houyaoxu
[¿¼²©] ¸£ÖÝ´óѧÑî»ÆºÆ¿ÎÌâ×éÕÐÊÕ2026Äêרҵѧλ²©Ê¿Ñо¿Éú£¬2026.03.20½ØÖ¹ +3 Xiangyu_ou 2026-03-12 3/150 2026-03-13 09:36 by duanwu655
ÐÅÏ¢Ìáʾ
ÇëÌî´¦ÀíÒâ¼û