3.
已知椭圆\(C\)的两个焦点为\(F_{1}(-1,0)\),\(F_{2}(1,0)\),且经过点\(E(1, \dfrac {3}{2})\).
\((1)\)求椭圆\(C\)的方程;
\((2)\)过\(F_{1}\)的直线\(l\)与椭圆\(C\)交于\(A\),\(B\)两点\((\)点\(A\)位于\(x\)轴上方\()\),若\( \overrightarrow{AF_{1}}=λ \overrightarrow{F_{1}B}\),且\( \dfrac {5}{3}\leqslant λ\leqslant \dfrac {7}{3}\),求直线\(l\)的斜率\(k\)的取值范围.