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 Re: ¥­¤è¼Æ

a^2+b^2+c^2=2x^2+2y^2+2z^2
(a+b+c)^2=2(x^2+y^2+z^2+ab+ac+bc)
a+b+c=°¸¼Æ
a,b,c 3¼Æ¤¤¥i¯à 1.¬Ò¬°°¸¼Æ
2.2¼Æ¬°©_¼Æ,1¼Æ¬°°¸¼Æ
±o¨ìªºµ²ªG¬O³£¤£¦X(Ãi±o¼g¤F)©Ò¥HµL¸Ñ

 2006-05-15 22:01
³X«È








 Re: ¥­¤è¼Æ

¤Þ¤å:

¼g¹D:
a^2+b^2+c^2=2x^2+2y^2+2z^2
(a+b+c)^2=2(x^2+y^2+z^2+ab+ac+bc)
a+b+c=°¸¼Æ
a,b,c 3¼Æ¤¤¥i¯à 1.¬Ò¬°°¸¼Æ
2.2¼Æ¬°©_¼Æ,1¼Æ¬°°¸¼Æ
±o¨ìªºµ²ªG¬O³£¤£¦X(Ãi±o¼g¤F)©Ò¥HµL¸Ñ



¦]¬°"(a+b+c)^2=2(x^2+y^2+z^2+ab+ac+bc)"
¤£ºÞx,y,z¤§­È¬°¦ó,a+b+c§¡¬°°¸¼Æ
¦ý"a+b+c=°¸¼Æ",À³µLªkª½±µ§PÂ_x,y,zµL¸Ñ

 2006-05-15 23:35
³X«È








 Re: ¥­¤è¼Æ

¡î
a^2=x^2+y^2
b^2=y^2+z^2
c^2=z^2+x^2
¡ï
a^2+b^2+c^2=2(x^2+y^2+z^2)
¡ï
(a+b+c)^2=2(x^2+y^2+z^2+xy+yz+zx)
¡ïa+b+c=¡Ô2 (x^2+y^2+z^2+xy+yz+zx)
¤Sa,b,c»Px,y,z¬Ò¬°¥¿¾ã¼Æ
a+b+c=¥¿¾ã¼Æ¤£¥i¯àµ¥©ó¡Ô2­¼¥H¥¿¾ã¼Æ
¡ïµL¸Ñ

 2006-05-16 18:54
³X«È








 Re: ¥­¤è¼Æ

§ó¥¿
¡î
a^2=x^2+y^2
b^2=y^2+z^2
c^2=z^2+x^2
¡ï
a^2+b^2+c^2=2(x^2+y^2+z^2)
¡ï
(a+b+c)^2=2(x^2+y^2+z^2+ab+bc+ca)
¡ïa+b+c=¡Ô2 (x^2+y^2+z^2+ab+bc+ca)
¤Sa,b,c»Px,y,z¬Ò¬°¥¿¾ã¼Æ
a+b+c=¥¿¾ã¼Æ¤£¥i¯àµ¥©ó¡Ô2­¼¥H¥¿¾ã¼Æ
¡ïµL¸Ñ


 2006-05-16 18:57
linian
Home away from home



µù¥U¤é: 2005-11-07
µoªí¼Æ: 292


 Re: ¥­¤è¼Æ

¤Þ¤å:

¼g¹D:
(a+b+c)^2=2(x^2+y^2+z^2+ab+bc+ca)
¡ïa+b+c=¡Ô2 (x^2+y^2+z^2+ab+bc+ca)



³o¤£¹ï§a¡A¦]¬°¦b®Ú¸¹®É¨S¦³§â
(x^2+y^2+z^2+ab+bc+ca)ºâ¶i¥h
¦pªG (x^2+y^2+z^2+ab+bc+ca)=2*k^2
µ²ªG´N¦¨¥ß¤F


_________________
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¤@ºüÇGÇO«HÆþÇMÆêÇeÇ@

 2006-05-16 19:46­Ó¤H¸ê®Æ¶Ç°e Email µ¹ linian«ô³Xºô¯¸
frog
Just can't stay away



µù¥U¤é: 2006-02-28
µoªí¼Æ: 114


 Re: ¥­¤è¼Æ

¤Þ¤å:

linian ¼g¹D:
¤Þ¤å:

¼g¹D:
(a+b+c)^2=2(x^2+y^2+z^2+ab+bc+ca)
¡ïa+b+c=¡Ô2 (x^2+y^2+z^2+ab+bc+ca)



³o¤£¹ï§a¡A¦]¬°¦b®Ú¸¹®É¨S¦³§â
(x^2+y^2+z^2+ab+bc+ca)ºâ¶i¥h
¦pªG (x^2+y^2+z^2+ab+bc+ca)=2*k^2
µ²ªG´N¦¨¥ß¤F

¦b¤UÃÙ¦P±zªº¬Ýªk
­Y(a+b+c)^2=2(x^2+y^2+z^2+ab+bc+ca)
«ha+b+c=[2(x^2+y^2+z^2+ab+bc+ca)]^(1/2)
°£«D¦³¿ìªkÃÒ©ú¥k¦¡¤£¥i¯à¬°¥¿¾ã¼Æ
§_«ha,b,c¤´¦³¥i¯à¬°¥¿¾ã¼Æ


 2006-05-16 23:36­Ó¤H¸ê®Æ
³X«È








 Re: ¥­¤è¼Æ

¦b¦¹´£¥X­Ó¤Hªº¸Ñªk
¦] ¬°
(a+b+c)^2=2(x^2+y^2+z^2+ab+bc+ca)
©Ò¥H
a,b.c¤T­Ó¼Æ¥²¬°¤T°¸©Î¨â©_¤@°¸
­Y¬°¤T°¸«hx,y,z¤]¬°¤T°¸
¦]¬°©_¼Æ¥­¤è¥[©_¼Æ¥­¤è¤£¥i¯à¦¨¬°¤@­Ó°¸¼Æªº¥­¤è(²³æµý©ú,½Ð¦Û¦æ³B²z)
©Ò¥H¤èµ{²Õ©Ò¦³ªº¼Æ¬Ò¬°°¸¼Æ,¬G¤èµ{²Õ¨âÃä¥i¦P°£4,ª½¦Ü¥ô¤@Ã䦳©_¼Æ¥X²{,¦¹®É±¡§Î¥u¦³¤@ºØ¥²¬°
©_^2=©_^2+°¸^2
©_^2=©_^2+°¸^2
°¸^2=°¸^2+°¸^2
©Ò¥H¦¹®Éx,y,z¬°¨â©_¤@°¸
¥N¦^ (a+b+c)^2=2(x^2+y^2+z^2+ab+bc+ca)
±o¨ì
°¸^2=2*(©_^2)
4*(¬Y¼Æ^2)=2*(©_^2) ¨âÃä¦P°£2±o
2*(¬Y¼Æ^2)=(©_^2)
±o¨ì °¸=©_
¬G¥Ù¬Þ,¦¹¤èµ{²ÕµL¾ã¼Æ¸Ñ

 2006-05-17 09:50
³X«È








 Re: ¥­¤è¼Æ

¥´¿ù¤F¤@­Ó¦a¤è,­«·s§ó¥¿
¦b¦¹´£¥X­Ó¤Hªº¸Ñªk
¦] ¬°
(a+b+c)^2=2(x^2+y^2+z^2+ab+bc+ca)
©Ò¥H
a,b.c¤T­Ó¼Æ¥²¬°¤T°¸©Î¨â©_¤@°¸
­Y¬°¤T°¸«hx,y,z¤]¬°¤T°¸
¦]¬°©_¼Æ¥­¤è¥[©_¼Æ¥­¤è¤£¥i¯à¦¨¬°¤@­Ó°¸¼Æªº¥­¤è(²³æµý©ú,½Ð¦Û¦æ³B²z)
©Ò¥H¤èµ{²Õ©Ò¦³ªº¼Æ¬Ò¬°°¸¼Æ,¬G¤èµ{²Õ¨âÃä¥i¦P°£4,ª½¦Ü¥ô¤@Ã䦳©_¼Æ¥X²{,¦¹®É±¡§Î¥u¦³¤@ºØ¥²¬°
©_^2=©_^2+°¸^2
©_^2=©_^2+°¸^2
°¸^2=°¸^2+°¸^2
©Ò¥H¦¹®Éx,y,z¬°¨â°¸¤@©_
¥N¦^ (a+b+c)^2=2(x^2+y^2+z^2+ab+bc+ca)
±o¨ì
°¸^2=2*(©_^2)
4*(¬Y¼Æ^2)=2*(©_^2) ¨âÃä¦P°£2±o
2*(¬Y¼Æ^2)=(©_^2)
±o¨ì °¸=©_
¬G¥Ù¬Þ,¦¹¤èµ{²ÕµL¾ã¼Æ¸Ñ

 2006-05-17 09:53
³X«È








 Re: ¥­¤è¼Æ

¹ï¤£°_
¤W­zªºµý©ú¬O¿ùªº
§Ú¦A«ä¦Ò¬Ý¬Ý

 2006-05-17 10:25
aa963854116
Home away from home



µù¥U¤é: 2006-01-06
µoªí¼Æ: 392
±q¥¼µo²{¤§89¸¹¬P®y

 Re: ¥­¤è¼Æ

¨S·Q¨ì¤@­ÓÃD¥Ø«o¤Þ°_³o»ò¤jªº°Q½×
"­Ó¤H"»{¬°°ò°¸©Ê¤ñ¸û¥i¦æ
¦ý~~«ç»òÃÒ©O?
§Æ±æ¤j®aÀ°¦£·Q·Q!!

 2006-05-17 19:14­Ó¤H¸ê®Æ
¨ì ( ¤W­¶ 1 | 2 | 3 | 4 ¤U­¶ )


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