答案1
像这样吗?
\documentclass[11pt,a4paper]{book}
\usepackage[greek]{babel}
\usepackage{graphicx}
\usepackage{linegoal}
\newcommand{\ultitle}[1]{\makebox[\linegoal][r]{#1}}
\usepackage{titlesec}
\titleformat{\chapter}[block]{ \bfseries\huge}{\fontfamily{qag}\selectfont
\bfseries\raisebox{-6pt}{\scalebox{3}{\thechapter}}}{4ex}
{\mbox{}\rlap{\rule[-6pt]{\linegoal}{1.6pt}}\ultitle}
\begin{document}
\chapter{Introduction}%
\end{document}