从一个点（字符）到另一个点的箭头形线

Question

谁能告诉我我该怎么做（如果可能的话)，类似于我在图片中展示的？（我的意思是带箭头的箭头形线条）。非常感谢。

Answer 1

我认为这肯定是重复的，但是，这是实现您需要的一种方法：

\documentclass{article}
\usepackage{amsmath}
\usepackage{tikz}
\usetikzlibrary{arrows.meta}
\newcommand{\mynode}[2]{\tikz[remember picture]{\node[inner sep=0pt](#1){$#2$};}}
\begin{document}
    blah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blah
    \[
    \mynode{fromhere}{2}\cdot(\mynode{toherea}{4}x^{2}+\mynode{tohereb}{3}x-\mynode{toherec}{6})= 8x^{2}+6x-12
    \]
    \begin{tikzpicture}[remember picture, overlay]
        \foreach \mytarget in {a,b,c}
        \draw[-Stealth] ([yshift=-2pt]fromhere.south) to [out=-90,in=-140] ([yshift=-2pt]tohere\mytarget.south);
    \end{tikzpicture}\vspace{6pt}

    blah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blah
\end{document}