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\documentclass[margin=5pt]{standalone}
\usepackage{tikz}

\begin{document} 
\begin{tikzpicture}[
  sibling distance=10em, 
  every node/.style = {
    shape=rectangle, rounded corners, 
    draw, align=center, 
    top color=white, bottom color=blue!20
  }
]
\node {7. }[grow'=up] 
child { node {5. } 
  child{node{3. } 
     child{node{2. }} 
     child{node{0. }}
  } 
  child{% <- kein Node auf Ebene 2
      child[missing]% linkes child auf Ebene 3 fehlt
      child{node{1. }}
  }
}; 
\end{tikzpicture} 
\end{document}

\documentclass[margin=5pt]{standalone}
\usepackage{tikz}

\begin{document} 
\begin{tikzpicture}[
  sibling distance=10em, 
  every node/.style = {
    shape=rectangle, rounded corners, 
    draw, align=center, 
    top color=white, bottom color=blue!20
  }
]
\node {7. }[grow'=up] 
child { node {5. } 
  child{node{3. } 
     child{node{2. }} 
     child{node{0. }}
  } 
  child{% <- kein Node auf Ebene 2
      child{node{1. }}% nur ein child auf Ebene 3
  }
}; 
\end{tikzpicture} 
\end{document}

\documentclass[]{beamer}
\usepackage[ngerman]{babel}
\usepackage[utf8]{inputenc}

\usepackage{tikz}


\setbeamertemplate{footline}[frame number]
\setbeamertemplate{navigation symbols}




\begin{document}
   \section{Auktionsagenten - Einführung}  
   \begin{frame}
      \frametitle{Auktionsagenten - Einführung}

       \begin{center}
          \begin{tikzpicture}[sibling distance=10em,
              every node/.style = {shape=rectangle, rounded corners,
                draw, align=center,
             top color=white, bottom color=blue!20}]]
        \node {7. }[grow'=up]
          child { node {5. }
             child{node{3. }
                child{node{2. }}
                child{node{0. }}}
             child{node{1. }}}
    ;
          \end{tikzpicture}

         \begin{tikzpicture}[sibling distance=10em,
              every node/.style = {shape=rectangle, rounded corners,
             draw, align=center,
               top color=white, bottom color=blue!20}]]
                  \node {9. }[grow'=up]
                   child { node {4. } } ;
         \end{tikzpicture}
       \end{center}


   
   
     


     

   \end{frame}

   
\end{document}