\ANG{
Bestimme jeweils Definitions- und L"osungsmenge:

\begin{enumerate}
\item $\D x-2 - {4 \over x-2} = x \cdot {x-4 \over x-2 } $
\item $\D {-3x \over x+3 } = { -21 \over x^2+3x} - {3x-7 \over x } $
\item $\D {x \over 2x+3 } = {x-3 \over 2x-1} $
\end{enumerate}

}
\LSG{
\begin{enumerate}
\item
$\DD=\QQ \setminus \{2\}$, $\LL= \DD$
\item 
$\DD=\QQ \setminus \{0;-3\}$, $\LL= \{\}$
\item
$\DD=\QQ \setminus \{0,5;-1,5\}$, $\LL= \{-4,5\}$
\end{enumerate}
}


