TeX & TikZ III｜newyork

8 樹形図 8-1 単純な数値の樹形図\begin{tikzpicture} \node[draw,inner sep=2pt](A)at(0,0){1}; \node[draw,inner sep=2pt](B)at(1,.75){1}; \node[draw,inner sep=2pt](C)at(1,.25){3}; \node[draw,inner sep=2pt](D)at(1,-.25){4}; \node[draw,inner sep=2pt](E)at(1,-.75){7}; \draw(A.east)--(B.west); \draw(A.east)--(C.west); \draw(A.east)--(D.west); \draw(A.east)--(E.west); \node[draw,inner sep=2pt](A)at(1.5,0){3}; \node[dra