Trong không gian Oxyz, cho các điểm A(2; -l; 0), B(l; 2; l), C(3...

Ta có \)">\overrightarrow{AB}=\left( -1;3;1 \right);\overrightarrow{AC}=\left( 1;-1;0 \right);{{\overrightarrow{n}}_{\left( ABC \right)}}=\left[ \overrightarrow{AB},\overrightarrow{AC} \right]=\left( 1;1;-2 \right){{\overrightarrow{n}}_{(ABC)}}=\left( 1;1;-2 \right)\left\{ \begin{aligned}
& x=1+t \\
& y=1+t \\
& z=-3-2t \\
\end{aligned} \right. \left\{ \begin{aligned}
& x=t \\
& y=t \\
& z=-1-2t \\
\end{aligned} \right.$