锟竭匡拷锟斤拷(sh锟斤拷)锟絎(xu锟斤拷)知锟絉(sh锟斤拷)锟絚(di锟斤拷n)锟斤拷锟斤拷锟斤拷锟絚(di锟斤拷n)锟剿癸拷式

锟斤拷(l锟斤拷i)源锟斤拷锟絎(w锟斤拷ng)锟絡(lu锟斤拷)锟結源 2019-05-07 11:21:00

[锟斤拷(bi锟斤拷o)锟斤拷锟斤拷锟竭匡拷锟斤拷(f锟斤拷)锟斤拷(x锟斤拷) 锟斤拷(sh锟斤拷)锟絎(xu锟斤拷)知锟絉(sh锟斤拷)锟絚(di锟斤拷n)]

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟絚(di锟斤拷n)锟斤拷a*b锟斤拷式锟斤拷a*b=|a|*|b|*sinθ锟斤拷sin锟斤拷a锟斤拷b锟侥夾锟斤拷锟斤拷取值[0,π]锟斤拷锟斤拷锟斤拷锟絜|c|=|a×b|=|a||b|sin<a锟斤拷b>锟斤拷锟絚(di锟斤拷n)锟斤拷锟街斤拷锟斤拷锟斤拷锟侥冿拷(n锟斤拷i)锟絜锟斤拷锟斤拷(sh锟斤拷)锟斤拷锟絜锟斤拷锟斤拷一锟斤拷(g锟斤拷)锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷一锟斤拷(g锟斤拷)锟斤拷锟斤拷锟较碉拷投影锟斤拷锟絃(zh锟斤拷ng)锟饺的乘積锟斤拷锟角橈拷(bi锟斤拷o)锟斤拷锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷锟絚(di锟斤拷n)锟剿癸拷式

锟斤拷锟斤拷锟斤拷锟斤拷锟侥乘凤拷锟叫兩種,锟街別锟缴烇拷锟�(n锟斤拷i)锟絜锟斤拷锟斤拷e锟斤拷

锟斤拷锟斤拷锟斤拷(n锟斤拷i)锟絜也锟絈锟斤拷(sh锟斤拷)锟斤拷锟絜锟斤拷锟斤拷?y锟斤拷n)锟斤拷锟結(ji锟斤拷)锟斤拷锟斤拷一锟斤拷(g锟斤拷)锟斤拷(sh锟斤拷)(锟斤拷(bi锟斤拷o)锟斤拷)锟斤拷锟斤拷锟斤拷a,b锟侥冿拷(n锟斤拷i)锟絜锟斤拷|a|*|b|cos<a,b>,锟斤拷锟斤拷<a,b>锟斤拷示a锟絚b锟侥夾锟角★拷

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷e也锟叫诧拷锟�锟斤拷锟斤拷Y(ji锟斤拷)锟斤拷锟斤拷一锟斤拷(g锟斤拷)锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟角帮拷锟斤拷锟斤拷系锟斤拷直锟絚a,b锟斤拷锟斤拷平锟斤拷|a|*|b|sin<a,b>

锟斤拷锟斤拷锟斤拷锟斤拷锟絜≠锟斤拷锟斤拷锟侥積锟斤拷锟斤拷锟斤拷锟侥積一锟斤拷指锟絚(di锟斤拷n)锟剿ｏ拷锟斤拷一锟斤拷要锟斤拷锟斤拷锟截區(q锟斤拷)锟斤拷锟絖(k锟斤拷i)锟斤拷锟斤拷锟絜锟斤拷矢锟絜锟斤拷锟絚锟斤拷(sh锟斤拷)锟斤拷锟絜锟斤拷锟斤拷(bi锟斤拷o)锟絜锟斤拷锟斤拷

锟斤拷锟斤拷a*b=|a|*|b|*sinθ锟斤拷锟斤拷a锟斤拷锟斤拷锟絚b锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟絜锟侥凤拷锟斤拷锟絚锟紷锟缴傦拷(g锟斤拷)锟斤拷锟斤拷锟斤拷锟斤拷平锟芥垂直锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟街讹拷锟絫锟斤拷一锟斤拷(g锟斤拷)锟斤拷(ji锟斤拷n)锟轿的確锟斤拷锟組锟斤拷“锟斤拷锟街讹拷锟絫”锟侥結(ji锟斤拷)锟斤拷锟斤拷锟斤拷锟侥凤拷锟斤拷姆锟斤拷锟斤拷锟斤拷@锟接的ｏ拷锟斤拷锟斤拷锟斤拷(bi锟斤拷o)系锟角滿锟斤拷锟斤拷锟街讹拷锟絫锟斤拷锟斤拷锟斤拷(d锟斤拷ng)锟斤拷锟街碉拷锟斤拷指锟斤拷a锟皆诧拷锟斤拷锟絕(gu锟斤拷)180锟饺碉拷锟紻(zhu锟斤拷n)锟斤拷锟紻(zhu锟斤拷n)锟斤拷b锟絩(sh锟斤拷)锟斤拷锟絈锟斤拷拇锟侥粗钢革拷锟斤拷锟絚锟侥凤拷锟斤拷锟斤拷