OEF 2άÏòÁ¿ --- ½éÉÜ ---

±¾Ä£¿éÄ¿Ç°ÓÐ 11 ¸öÓÐ¹Ø 2 άÏòÁ¿µÄÁ·Ï° (ÏßÐÔ×éºÏ, ½Ç, ³¤¶È, ÄÚ»ýµÈ).

ƽÐÐËıßÐÎÃæ»ý

¼ÆËãƽÃæÄÚÓÉÒÔÏ 4 ¸öÏòÁ¿µÄÖյ㹹³ÉµÄƽÐÐËıßÐεÄÃæ»ý:

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


Îå±ßÐÎÃæ»ý

¼ÆËãƽÃæÄÚÎå±ßÐÎ ABCDE µÄÃæ»ý, Æä 5 ¸ö¶¥µãÊÇ

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


ËıßÐÎÃæ»ý

¼ÆËãƽÃæÄÚËıßÐÎ ABCD µÄÃæ»ý, Æä 4 ¸ö¶¥µãÊÇ

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

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Èý½ÇÐÎÃæ»ý

¼ÆËãƽÃæÄÚÈý½ÇÐεÄÃæ»ý, Æä 3 ¸ö¶¥µãÊÇ

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


½Ç

ƽÃæÄÚÓÐ 3 ¸öµã:

, , .

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


ÏßÐÔ×éºÏ

Éè

v1 = (,) , v2 = (,)

ÊÇƽÃæµÄ 2 ¸öÏòÁ¿, ¼ÆËãÏòÁ¿

v = .


3¸öÏòÁ¿µÄ×éºÏ

Éè

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

ÊÇƽÃæµÄ 3 ¸öÏòÁ¿, ¼ÆËãÏòÁ¿

v = .


ÇóÏßÐÔ×éºÏ

Éè

v1 = (,) , v2 = (,)

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

v = av1 + bv2 .


ÒÑÖªÄÚ»ý

Éè

v1 = (,) , v2 = (,)

ÊÇƽÃæµÄ 2 ¸öÏòÁ¿, ÇóÏòÁ¿ v ʹËüÓÐÒÔϵÄÄÚ»ý

<v,v1> = , ÒÔ¼° <v,v2> = .


ƽÐÐËıßÐεĶ¥µã

ÔÚƽÃæÀïÓÐÒ»¸öƽÐÐËıßÐÎ ABCD, ÆäÖÐ 3 ¸ö¶¥µãµÄ×ø±êÊÇ

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

¼ÆËãµÚ 4 ¸ö¶¥µã D µÄ×ø±ê.


ÏßÐÔ¹Øϵ

ÒÑÖª 3 ¸öƽÃæÏòÁ¿:

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

Çó 3 ¸öÕûÊý a,b,c ʹµÃ

a v1 + b v2 + c v3 = 0 ,

µ«ÊÇÕâЩÕûÊý a,b,c ±ØÐ벻ȫΪÁã.

±ðµÄÀàËÆÁ·Ï°:
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