如何在这两个公式中添加括号/方括号？

Question

我不明白如何在这两个形式中添加括号/方括号，我尝试过“/right)”和“\left(”，但没有成功。请帮忙，我应该如何编辑此代码以获取附加的图片（我指出了需要添加的括号）？我不能对代码进行太多更改。我需要保存所有“mathord”和“vphantom”，并尽量少地更改代码。

    \left( {{{\alpha_{{\dot{h}}} s + \alpha_{h} } 
\mathord{\left/ {\vphantom {{\alpha_{{\dot{h}}} s + \alpha_{h} } 
{s^{2} + \alpha_{{\dot{h}}} s + \alpha_{h} }}} \right. \kern-0pt} 
{s^{2} + \alpha_{{\dot{h}}} s + \alpha_{h} }}} \right).

和

    \mathop {\lim }\limits_{s \to 0} s\left( {{{s^{2} } 
\mathord{\left/ {\vphantom {{s^{2} } 
{s^{2} + \alpha_{{\dot{h}}} s + \alpha_{h} }}} \right. \kern-0pt} 
{s^{2} + \alpha_{{\dot{h}}} s + \alpha_{h} }}} \right)h_{i}^{c} = 0

Answer 1

像这样？

\documentclass{article}
\usepackage{amsmath}

\begin{document}
\[
  \bigl( \alpha_{\dot{h}} s + \alpha_{h} \bigr) /
  \bigl( s^{2} + \alpha_{\dot{h}} s + \alpha_{h} \bigr).
\]
\[
  \lim_{s \to 0} s
  \bigl( s^{2} \bigr) /
  \bigl( s^{2} + \alpha_{\dot{h}} s + \alpha_{h} \bigr)
  h_{i}^{c} = 0
\]
\end{document}

编辑

只需\big(插入\big)

\documentclass{article}

\begin{document}
\[
    \left( {{{\alpha_{{\dot{h}}} s + \alpha_{h} } \big)
\mathord{\left/ {\vphantom {{\alpha_{{\dot{h}}} s + \alpha_{h} }
{s^{2} + \alpha_{{\dot{h}}} s + \alpha_{h} }}} \right. \kern-0pt} 
{\big( s^{2} + \alpha_{{\dot{h}}} s + \alpha_{h} }}} \right).
\]
\[
    \mathop {\lim }\limits_{s \to 0} s\left( {{{s^{2} \big) } 
\mathord{\left/ {\vphantom {{s^{2} } 
{s^{2} + \alpha_{{\dot{h}}} s + \alpha_{h} }}} \right. \kern-0pt} 
{\big( s^{2} + \alpha_{{\dot{h}}} s + \alpha_{h} }}} \right)h_{i}^{c} = 0
\]
\end{document}