% 
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\ANG{
Berechne:
\begin{enumerate}
\item $\frac{12}{24}-\frac{1}{3}+\frac{7}{42}$
\item $(\frac{12}{24}+\frac{15}{20}):\frac{27}{36}$
\end{enumerate}
}
\LSG{
(a) $\frac{1}{3}$\qquad (b) $2$
}

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