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±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 = () .
xrange -15,15 yrange -15,15 arrow -15,0,15,0,10,grey arrow 0,-15,0,15,10,grey linewidth 2 polygon red,,,,,,,, linewidth 4 points blue,,,,,,,,
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.
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ÓÉÓÚ WIMS ²»ÄÜʶ±ðÄúµÄä¯ÀÀÆ÷, ±¾Ò³²»ÄÜÕý³£ÏÔʾ.
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- Description: ¹ØÓÚ2άÏòÁ¿µÄÒ»×éÁ·Ï°. exercises interactifs, calcul et trac� 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