OEF 3άÏòÁ¿ --- ½éÉÜ ---

±¾Ä£¿éÄ¿Ç°ÓÐ 19 ¸öÓÐ¹Ø 3 άÏòÁ¿µÄÁ·Ï° (ÏßÐÔ×éºÏ, ½Ç, ³¤¶È, ÄÚ»ý, Íâ»ý, »ìºÏ»ýµÈ).

ƽÐÐËıßÐÎÃæ»ý

¼ÆËãÅ·¼¸ÀïµÂ¿Õ¼äÄÚÓÉÒÔÏ 4 ¸öÏòÁ¿µÄÖյ㹹³ÉµÄƽÐÐËıßÐεÄÃæ»ý:

(,,) , (,,) , (,,) , (,,) .


Èý½ÇÐÎÃæ»ý

¼ÆËãÅ·¼¸ÀïµÂ¿Õ¼äÄÚÓÉÒÔÏ 3 ¸öÏòÁ¿¹¹³ÉµÄÈý½ÇÐεÄÃæ»ý:

(,,) , (,,) , (,,) .


½Ç

¿Õ¼äÓÐ 3 ¸öµã:

, , .

¼ÆËã½Ç (ÒÔ¶ÈΪµ¥Î», È¡ÖµÔÚ 0 Óë 180 Ö®¼ä).


×éºÏ

Éè

v1 = (,,) , v2 = (,,) , v3 = (,,)

ÊÇ¿Õ¼äµÄ 3 ¸öÏòÁ¿, ¼ÆËãÏòÁ¿

v = .


2¸öÏòÁ¿µÄ×éºÏ

Éè

v1 = (,,) , v2 = (,,)

ÊÇ¿Õ¼äµÄ 2 ¸öÏòÁ¿, ¼ÆËãÏòÁ¿

v = .


4¸öÏòÁ¿µÄ×éºÏ

Éè

v1 = (,,) , v2 = (,,) , v3 = (,,) , v4 = (,,)

ÊÇ¿Õ¼äµÄ 4 ¸öÏòÁ¿, ¼ÆËãÏòÁ¿

v = .


ÇóÏòÁ¿µÄ×éºÏ

Éè

v1 = (,,) , v2 = (,,) , v3 = (,,)

ÊÇ¿Õ¼äµÄ 3 ¸öÏòÁ¿, v=(,,) ÊÇÁíÒ»ÏòÁ¿. ÊÔ°Ñ v ±íʾ³É v1, v2 Óë v3 µÄÏßÐÔ×éºÏ:

v = av1 + bv2 + cv3 .


ÇóÁ½¸öÏòÁ¿µÄ×éºÏ

Éè

v1 = (,,) , v2 = (,,)

ÊÇ¿Õ¼äµÄ 2 ¸öÏòÁ¿, v=(,,) ÊÇÁíÒ»ÏòÁ¿. ÊÔ°Ñ v ±íʾ³É v1 ºÍ v2 µÄÏßÐÔ×éºÏ:

v = av1 + bv2 .


ÒÑÖªÄÚ»ý

Éè

v1 = (,,) , v2 = (,,) , v3 = (,,)

ÊÇ¿Õ¼äµÄ 3 ¸öÏòÁ¿, ÇóÏòÁ¿ v ʹËüÓÐÒÔϵÄÄÚ»ý:

<v,v1> = , <v,v2> = , <v,v3> = .


ÒÑÖªÍâ»ý

Éè u=(,,) ÊÇ¿Õ¼äÏòÁ¿. ÇóÏòÁ¿ v=(,b,c) ʹËüÓÐÒÔϵÄÍâ»ý

u v = (,,) .


Íâ»ýÓ볤¶È

Éè u=(,,) ÊÇ¿Õ¼äÏòÁ¿. ÏòÁ¿ v ´¹Ö±ÓÚ u. ÒÑÖª v µÄ³¤µÈÓÚ , ÎÊÍâ»ý u v µÄ³¤ÊǶàÉÙ?

Íâ»ýÓ볤¶È II

Éè u=(,,) ÊÇ¿Õ¼äÏòÁ¿. ÏòÁ¿ v µÄ³¤¶ÈÊÇ. ÒÑÖªÄÚ»ý <u,v> = , ÎÊÍâ»ý u v µÄ³¤ÊǶàÉÙ?

ƽÐÐËıßÐεĶ¥µã

ÔÚÅ·¼¸ÀïµÂ¿Õ¼äÀïÓÐÒ»¸öƽÐÐËıßÐÎ ABCD, ÆäÖÐ 3 ¸ö¶¥µãµÄ×ø±êÊÇ

A = (,,) , B = (,,) , C = (,,) .

¼ÆËãµÚ 4 ¸ö¶¥µã D µÄ×ø±ê.


ÓëÁ½¸öÏòÁ¿´¹Ö±

Éè

v1 = (,,) , v2 = (,,)

ÊÇÁ½¸ö¿Õ¼äÏòÁ¿. ÏòÁ¿ v=(a,b,) ͬʱ´¹Ö±ÓÚ v1 ºÍ v2. ÇóÏòÁ¿ v ?


´¹Ö±ÓëÍâ»ý

Éè u=(,,) ÊÇ¿Õ¼äÏòÁ¿. ÇóÓë u ´¹Ö±µÄÏòÁ¿ v, ʹµÃÆäÍâ»ýÊÇ u v = (,,).

ÏßÐÔ¹Øϵ

ÎÒÃÇÓÐ 4 ¸ö¿Õ¼äÏòÁ¿:

v1 = (,,) , v2 = (,,) , v3 = (,,) , v4 = (,,) .

Çó 4 ¸öÕûÊý a,b,c,d ʹµÃ

a v1 + b v2 + c v3 + d v4 = 0 ,

µ«ÕâЩÕûÊý a,b,c,d ²»È«ÎªÁã.


ÄÚ»ýÓëÍâ»ý

Éè u=(,,) ÊÇ¿Õ¼äÏòÁ¿. ÇóÏòÁ¿ v ʹÆäÄÚ»ýΪ <u,v> = , Íâ»ýΪ u v = (,,).

ƽÐÐÁùÃæÌåÌå»ý

¼ÆËã¿Õ¼äƽÐÐÁùÃæÌåµÄÌå»ý, Æ䶥µã A = (,,), ÆäËü 3 ¸öÓë A ÏàÁڵĶ¥µãÊÇ

B = (,,) , C = (,,) , D = (,,) .


ËÄÃæÌåÌå»ý

¼ÆËã¿Õ¼äËÄÃæÌåµÄÌå»ý, Æä 4 ¸ö¶¥µãÊÇ

A = (,,) , B = (,,) , C = (,,) , D = (,,) .

±ðµÄÀàËÆÁ·Ï°:
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