9.
已知椭圆\({C}_{1}\;:\; \dfrac{{x}^{2}}{{a}^{2}}+ \dfrac{{y}^{2}}{{b}^{2}}=1\left(a > b > 0\right) \) 经过点\(M\left(1, \dfrac{3}{2}\right) \),且其右焦点与抛物线\({C}_{2}\;:\;{y}^{2}=4x \)的焦点\(F\)重合,过点\(F\)且与坐标轴不垂直的直线与椭圆交于\(P\),\(Q\)两点.
\((1)\)求椭圆\({C}_{1} \)的方程;
\((2)\)设\(O\)为坐标原点,线段\(OF\)上是否存在点\(N\left(n,0\right) \),使得\( \overrightarrow{QP}· \overrightarrow{NP}= \overrightarrow{PQ}· \overrightarrow{NQ} \)?若存在,求出\(n\)的取值范围;若不存在,说明理由;
\((3)\)过点\({P}_{0}\left(4,0\right) \)且不垂直于\(x\)轴的直线与椭圆交于\(A\),\(B\)两点,点\(B\)关于\(x\)轴的对称点为\(E\),试证明:直线\(AE\)过定点.