计算:

(1) $\sqrt{25}+\sqrt[3]{-8}-\sqrt{6^{2}}$

(2) $\sqrt{(-3)^{2}}+\sqrt{6}+|\sqrt{6}-3|$
(1) 解: $\sqrt{25}+\sqrt[3]{-8}-\sqrt{6^{2}}$

$$
\begin{gathered}
=5+(-2)-6 \\
=-3
\end{gathered}
$$

(2) 解: $\sqrt{(-3)^{2}}+\sqrt{6}+|\sqrt{6}-3|$

$$
\begin{gathered}
=3+\sqrt{6}+3-\sqrt{6} \\
=6
\end{gathered}
$$