16.令E：x+z=2為坐標空間中過三點A(2,-1,0)、B(0,1,2)、C(-2,1,4)的平面。另有一點P在平面z=1上且其於E之投影點與A、B、C三點等距離。則點P與平面E 的距離為_________。（化為最簡根式）

V. Composition (30%)Since its outbreak, COVID-19 has significantly changed our society, economies, and health care systems throughout the world. In the midst of extraordinary challenges and uncertainty posed by the pandemic, son me people believe that there must be a silver lining. Please write an essay within 600 words to discuss the challenges and opportunities in the post-Covid-19 era.

16.令E：x+z=2為坐標空間中過三點A(2,-1,0)、B(0,1,2)、C(-2,1,4)的平面。另有一 點P在平面z=1上且其於E之投影點與A、B、C三點等距離。則點P與平面E 的距離為_________。（化為最簡根式）

其他申論題

16.令E：x+z=2為坐標空間中過三點A(2,-1,0)、B(0,1,2)、C(-2,1,4)的平面。另有一點P在平面z=1上且其於E之投影點與A、B、C三點等距離。則點P與平面E 的距離為_________。（化為最簡根式）