Cho (d1):{x=ty=52tz=143t       (d2):{x=14ay=2+az=1+5a
(d3) là giao của 2 mặt phẳng (P):x4y7=0;(Q):4x+4z35=0

a)   xét vị trí tương đối (d1)(d2)
b)   xét vị trí tương đối (d1)(d3)
c)   tìm giao điểm của (d1);(d3) (Nếu có)
d)   viết pt (R) chứa (d1)(R)//(d2)
Nhấn vote up nếu trả lời đúng –  xxxjimmy 19-02-13 03:03 PM
c) theo câu b nên không có giao điểm
d)
(R)điquad1(R)códng:(a+3)x+y+az14a5=0 
gin(a+3,1,a)làVPTca(R);tacó:n.u2=0vì(R)//d2 
hay:4(a+3)+1+5a=0a=11vy(R):14x+y+11z159=0
a)(d1)nhnu1(1,2,3)làmVTCPvàu2(4,1,5)làVCTPca(d2)
ddàngtính[u1,u2]=(7,7,7)
giAd1Bd2AB=(1,3,15) 
xét[u1,u2]AB=770vyd1vàd2chéonhau 
b)
 tđbài(d3):{x=2ty=7412tz=35412t
làmtgtcâuad3àd1chéonhau 
Nhấn vote up nếu trả lời đúng –  xxxjimmy 19-02-13 03:03 PM

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