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+\documentclass[10pt,a4paper]{article}
+\usepackage[utf8]{inputenc}
+\usepackage[ngerman]{babel}
+\usepackage[T1]{fontenc}
+\usepackage{amsmath}
+\usepackage{amsfonts}
+\usepackage{amssymb}
+\usepackage[left=2cm,right=2cm,top=2cm,bottom=2cm]{geometry}
+\usepackage{enumitem}
+\author{Beat Jäckle (Jb)}
+\begin{document}
+Lösungen für die Rohfassung: Mathematik fürs Gymnasium
+\setcounter{section}{4}
+\setcounter{subsection}{1}
+\subsection{Üben und anwenden}
+Aufgabe 1
+\begin{enumerate}[label=\alph*)]
+\item $(-1,3)$
+\item $(2.5,-1)$
+\item $\left(\frac{114}{11},-\frac{50}{11}\right)$
+\item $(5,2)$ %d
+\item $\left(\frac{b+c}{a+b},\frac{ac+b^2+2bc}{a+b}\right)$
+\item $\left(\frac{3}{2}t,-2t\right)$
+\end{enumerate}
+\end{document}
\ No newline at end of file