\ANG{Berechne:
(a)\quad$\D\frac{14}{45}-\frac{11}{30}$\qquad
(b)\quad$\D 2\frac{3}{7}-630\,\%$\qquad
}
\LSG{
\begin{enumerate}

\item $\D\frac{14\cdot 2-11\cdot 3}{90}=-\frac{5}{90}=-\frac{1}{18}$
\item $\D 2\frac{3}{7}-6\frac{3}{10}=
-\left(6\frac{21}{70}-2\frac{30}{70}\right)=
-\left(5\frac{91}{70}-2\frac{30}{70}\right)=-3\frac{61}{70}$
\end{enumerate}
}
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