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 = (,,) .
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- Description: ¹ØÓÚ3άÏòÁ¿µÄÒ»×éÁ·Ï°. exercises interactifs, calcul et tracé de graphes en ligne
- Keywords: interactive mathematics, interactive math, server side interactivity, algebra, linear algebra, geometry, vector, cross product, addition, linear combination, polygon, polyhedron, parallelogramme, parallelepipede