A. Hai đường thẳng d và d’ chéo nhau

B. Đường thẳng d song song với đường thẳng d’

C. Đường thẳng d cắt đường thẳng d’

D. Đường thẳng d trùng với đường thẳng d’

A. (-2;1;2)

B. (-2;1;1)

C. (1;1;1)

D. (2;-1;-2).

A.  $\left\{\begin{array}{l}x=2\\ y=3-t\\ z=3-t\end{array}\right.$

B. $\left\{\begin{array}{l}x=-2\\ y=-3-t\\ z=-3-t\end{array}\right.$

C. $\left\{\begin{array}{l}x=-2\\ y=-3+t\\ z=-3+t\end{array}\right.$

D. $\left\{\begin{array}{l}x=2\\ y=-3+t\\ z=3+t\end{array}\right.$

A.  $\left\{\begin{array}{l}\begin{array}{l}x= t \\ y= 3t \end{array}\\ z= -t \end{array}\right.$

B.  $\left\{\begin{array}{l}\begin{array}{l}x= t \\ y= - 3t \end{array}\\ z= -t \end{array}\right.$

C.  $\frac{x }{1 }=\frac{y }{3 }=\frac{z }{-1 }$

D.  $\left\{\begin{array}{l}\begin{array}{l}x= 0 \\ y= - 3t \end{array}\\ z= t \end{array}\right.$

A.  $\left\{\begin{array}{l}x=2\\ y=3-t\\ z=3-t\end{array}\right.$

B. $\left\{\begin{array}{l}x=-2\\ y=-3-t\\ z=-3-t\end{array}\right.$

C. $\left\{\begin{array}{l}x=-2\\ y=-3+t\\ z=-3+t\end{array}\right.$

D. $\left\{\begin{array}{l}x=2\\ y=-3+t\\ z=3+t\end{array}\right.$

A.  $\left\{\begin{array}{l}x=2\\ y=3-t\\ z=3-t\end{array}\right.$

B.  $\left\{\begin{array}{l}x=-2\\ y=-3-t\\ z=-3-t\end{array}\right.$

C.  $\left\{\begin{array}{l}x=-2\\ y=-3+t\\ z=-3+t\end{array}\right.$

D.  $\left\{\begin{array}{l}x=2\\ y=-3+t\\ z=3+t\end{array}\right.$

A. K(4;3;3)

B. K(1;-3;3)

C. K(-4;-3;-3)

D. K(-1;3;-3)

A.  $\frac{x+3}{5}=\frac{y-2}{-1}=\frac{z-1}{1}$

B. $\frac{x+3}{-5}=\frac{y-2}{1}=\frac{z-1}{-1}$

C. $\frac{x-3}{-5}=\frac{y+2}{1}=\frac{z+1}{-1}$

D. $\frac{x+8}{1}=\frac{y-3}{3}=\frac{z}{-4}$