Trong không gian $Oxyz$, cho điểm $A\left( 1;2;-3 \right)$ và mặt...

Gọi \)">EABE\left( -\dfrac{1}{2};0;-1 \right)IE\left( P \right)I\left( P \right)ABMBMBIMBBI\Delta E\left( P \right)\Delta :\left\{ \begin{aligned}
& x=-\dfrac{1}{2}+2t \\
& y=2t \\
& z=-1-t \\
\end{aligned} \right.I\Delta :\left\{ \begin{aligned}
& x=-\dfrac{1}{2}+2t \\
& y=2t \\
& z=-1-t \\
& 2x+2y-z+9=0 \\
\end{aligned} \right.\Rightarrow 2\left( -\dfrac{1}{2}+2t \right)+2.2t-\left( -1-t \right)+9=0\Leftrightarrow t=-1\Rightarrow I\left( -\dfrac{5}{2};-2;0 \right)2\overrightarrow{IB}=\left( 1;0;2 \right)BM:\left\{ \begin{aligned}
& x=-2+t \\
& y=-2 \\
& z=1+2t \\
\end{aligned} \right.BMI\left( 3;-2;11 \right)t=5$ ).