added frac dfrac example

math/fractions/Makefile

@@ -0,0 +1,6 @@
+make:
+	pdflatex fractions.tex -output-format=pdf
+	make clean
+
+clean:
+	rm -rf  $(TARGET) *.class *.html *.log *.aux

math/fractions/fractions.tex

@@ -0,0 +1,36 @@
+\documentclass[a4paper,9pt]{scrartcl}
+\usepackage[ngerman]{babel} 
+\usepackage[utf8]{inputenc}
+\usepackage{amssymb,amsmath}
+\usepackage{geometry}
+\geometry{a4paper,left=18mm,right=18mm, top=2cm, bottom=2cm} 
+
+\begin{document}
+\section{frac}
+Lorem ipsum dolor sit amet, te virtute officiis eos. Aliquid 
+adipiscing repudiandae nam ei, eu vel quod vituperata. Qui quem 
+recteque petentium et, alterum delenit ullamcorper ut mea. Stet 
+volumus his id, ei cum nulla corrumpit. Quo et ubique adolescens, 
+dicam vituperata vim ei.
+
+    \begin{itemize}
+      \item $\frac{1}{3}$ is less than $\frac{1}{3}$
+      \item $\frac{ab \cdot x^5 + x^2 + 2 \cdot x + 123}{t}$ is a really long fraction.
+      \item $\frac{ab \cdot x^5 + x^2 + 2 \cdot x + 123 + \frac{xyz}{\cos \alpha}}{t}$ is double fraction
+      \item $\frac{ab \cdot x^5 + x^2 + 2 \cdot x + 123 + \frac{xyz \cdot \frac{1}{2}}{\cos \alpha}}{t}$ is double fraction
+    \end{itemize}
+
+\section{dfrac}
+Lorem ipsum dolor sit amet, te virtute officiis eos. Aliquid 
+adipiscing repudiandae nam ei, eu vel quod vituperata. Qui quem 
+recteque petentium et, alterum delenit ullamcorper ut mea. Stet 
+volumus his id, ei cum nulla corrumpit. Quo et ubique adolescens, 
+dicam vituperata vim ei.
+
+    \begin{itemize}
+      \item $\dfrac{1}{3}$ is less than $\dfrac{1}{3}$
+      \item $\dfrac{ab \cdot x^5 + x^2 + 2 \cdot x + 123}{t}$ is a really long fraction.
+      \item $\dfrac{ab \cdot x^5 + x^2 + 2 \cdot x + 123 + \dfrac{xyz}{\cos \alpha}}{t}$ is double fraction
+      \item $\dfrac{ab \cdot x^5 + x^2 + 2 \cdot x + 123 + \dfrac{xyz \cdot \dfrac{1}{2}}{\cos \alpha}}{t}$ are a lot of fraction
+    \end{itemize}
+\end{document}