求:将3x+2y+z-2=0和x+2y+3z+2=0,变为参数式和对称方程
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求:将3x+2y+z-2=0和x+2y+3z+2=0,变为参数式和对称方程
求:将3x+2y+z-2=0和x+2y+3z+2=0,变为参数式和对称方程
求:将3x+2y+z-2=0和x+2y+3z+2=0,变为参数式和对称方程
先求方向向量 s=
|i j k|
|3 2 1|
|1 2 3|
=4i-8j+4k
然后求直线上一点.
取y=0,=>x=1 z=-1
=>对称方程
(x-1)/4=y/(-8)=(z+1)/4
=>(x-1)=-y/2=(z+1)=t
=>参数式方程
x=1+t
y=-2t
z=t-1