\documentclass[spanish]{article}
\usepackage{libertine}
\usepackage{libertinust1math}
\usepackage[T1]{fontenc}
\begin{document}
Here is the tenth part of one: $0,1$.
\end{document}
答案1
您应该加载 babel 并使用点表示小数:
\documentclass[spanish]{article}
\usepackage{babel}
\begin{document}
Here is the tenth part of one: $0.1$.
\end{document}