\((1)\)已知\(p\):\(x\)\({\,\!}^{2}-2\)\(x\)\(-3\leqslant 0\);\(q: \dfrac{1}{X-2}\leqslant 0 \),若\(p\)且\(q\)为真,则\(x\)的取值范围是 ______.
\((2)\)等差数列\(\{\)\(a_{n}\)\(\}\)中,\(a\)\({\,\!}_{1}=25\),\(S_{17}=S_{9}\),则当\(n\)\(= \)______时,\(S\)\({\,\!}_{n}\)有最大值.
\((3)\)平行四边形\(ABCD\)中,\(E\)为\(CD\)的中点,动点\(G\)在线段\(BE\)上,\( \overrightarrow{AG}=x \overrightarrow{AB}+y \overrightarrow{AD} \),则\(2\)\(x\)\(+\)\(y\)\(= \)______.
\((4)\)已知\(\triangle ABC\)中,\(AB=2 \sqrt{3} \),\(AC+ \sqrt{3} BC=6\),\(D\)为\(AB\)的中点,当\(CD\)取最小值时,\(\triangle ABC\)面积为 ______.