答案1
你不需要任何东西,只要基本的 Ti钾Z 就是那个。
\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}[scale=2]
\draw[->] (0,0,0) -- (3,0,0) node[below]{$x_1$};
\draw[->] (0,0,0) -- (0,0,3) node[below]{$x_2$};
\draw[->] (0,0,0) -- (0,3,0) node[left]{$x_3$};
\node[circle,draw,fill=black,label=below:$T_1$,scale=0.7] (b1) at (0,0,2){};
\node[circle,draw,fill=black,label=below:$T_2$,scale=0.7] (b2) at (2,0,0){};
\node[circle,draw,fill=black,label=right:$T_2$,scale=0.7] (b3) at (0,2,0){};
\draw[thick,-] (b1) -- node[midway,below,sloped]{$g$ (Schnittgerade)} (b2) -- (b3) -- (b1);
\fill[blue,opacity=0.2] (2,0,0) -- (0,0,2) -- (0,3,2) -- (2,3,0) -- node[midway,right]{$E$} cycle;
\end{tikzpicture}
\end{document}