\ANG{
Klammere so aus, dass in der Klammer kein Bruch mehr steht:

\begin{tabular}[t]{llll}
  (a) & $\D\frac{x}{4}-\frac{y}{2}-\frac{z}{8}$ & 
  (b) & $\D\frac{ab^{2}}{3}+\frac{a^{2}b}{2}-\frac{ab}{6}$\rule[-5mm]{0mm}{12mm} \\
  (c) & $\D\frac{rs}{7}+\frac{rt}{3}+\frac{st}{11}$ & 
  (d) & $\D\frac{3a^{3}}{70}-\frac{4a^{2}}{63}+\frac{3a^{4}}{35}$ \\
\end{tabular}
}
%
\LSG{
\begin{tabular}[t]{llll}
  (a) & $\D\frac{1}{8}(2x-4y-z)$ & 
  (b) & $\D\frac{ab}{6}(2b+3a-1)$\rule[-5mm]{0mm}{12mm} \\
  (c) & $\D\frac{1}{231}(33rs+77rt+21st)$ & 
  (d) & $\D\frac{a^{2}}{630}(27a-40+54a^{2})$ \\
\end{tabular}
}
