题目
点(2,3,1)在直线x=t-7,y=2t-2,z=3t-2上的投影为()A. (-5,2,4)B. (-6,0,1)C. (-7,-2,-2)D. (-8,-4,-5)
点$(2,3,1)$在直线$x=t-7,y=2t-2,z=3t-2$上的投影为()
A. $(-5,2,4)$
B. $(-6,0,1)$
C. $(-7,-2,-2)$
D. $(-8,-4,-5)$
题目解答
答案
A. $(-5,2,4)$
A. $(-5,2,4)$
B. $(-6,0,1)$
C. $(-7,-2,-2)$
D. $(-8,-4,-5)$