答案1
我更喜欢更细长的括号,但说服 LaTeX 使用 CM 括号并不难。
\documentclass{article}
\usepackage{newtxtext,newtxmath}
% Define the usual CM extension font
\DeclareSymbolFont{CMlargesymbols}{OMX}{cmex}{m}{n}
% Redeclare the parentheses to use CM for larger sizes
\DeclareMathDelimiter{(}{\mathopen} {operators}{"28}{CMlargesymbols}{"00}
\DeclareMathDelimiter{)}{\mathclose}{operators}{"29}{CMlargesymbols}{"01}
% a better command than \left(\frac{x}{y}\right)
\newcommand{\jacobi}[2]{\genfrac{(}{)}{}{}{#1}{#2}}
\begin{document}
\[
\jacobi{5}{103}\cdot\jacobi{103}{5}=
(-1)^{\frac{103-1}{2}\cdot\frac{5-1}{2}}=1
\]
\end{document}