如何在以下乳胶代码中的括号内书写

Question

\documentclass[12pt,a4paper]{article}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{dirtytalk}
\usepackage{blindtext}
\usepackage{graphics}
\usepackage{tgbonum}
\usepackage{tikz}
\usepackage{mathtools}
\usepackage{flexisym}
\usepackage{cite}  
\usepackage{nth}
\usepackage{amsthm}

\begin{document}
$$1,\underbrace{\frac{1}{2^2},\frac{1}{2^2},\frac{1}{2^2},\frac{1}{2^2}}_\text{2^2 times},\frac{1}{6^2},\frac{1}{8^2},\frac{1}{9^2},\frac{1}{10^2},\frac{1}{11^2},\frac{1}{12^2},\frac{1}{13^2},
\underbrace{\frac{1}{14^2},\frac{1}{14^2},\cdots,\frac{1}{14^2}}_\text{ times},\cdots$$
\end{document}

我尝试在括号内书写。但写不出来。请帮忙

Answer 1

方法如下：

\documentclass[12pt,a4paper]{article}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{dirtytalk}
\usepackage{blindtext}
\usepackage{graphics}
\usepackage{tgbonum}
\usepackage{tikz}
\usepackage{mathtools}
\usepackage{flexisym}
\usepackage{cite}  
\usepackage{nth}
\usepackage{amsthm}


\begin{document}
\[
1,\underbrace{\frac{1}{2^2},\frac{1}{2^2},\frac{1}{2^2},\frac{1}{2^2}}_{\text{$2^2$ times}},\frac{1}{6^2},\frac{1}{8^2},\frac{1}{9^2},\frac{1}{10^2},\frac{1}{11^2},\frac{1}{12^2},\frac{1}{13^2},
\underbrace{\frac{1}{14^2},\frac{1}{14^2},\cdots,\frac{1}{14^2}}_{\text{ times}},\cdots
\]
\end{document}

PS：您必须将第二个参数放在\underbrace花括号内......