2.
\((1)\)如果函数\(f(x)=x^{3}+ax^{2}+(a-4)x\),\((a∈R)\)的导函数\(f{{'}} (x)\)是偶函数,则曲线\(y=f(x)\)在原点处的切线方程是________.
\((2)\)设\(f(x)=\begin{cases}{x}^{2},x∈[0,1] \\ \dfrac{1}{x},x∈(1,{e}^{2}]\end{cases} (\)其中\(e\)为自然对数的底数\()\),则\(∫_{0}^{{e}^{2}}f(x)dx \)的值为________.
\((3)\)若数列\(\{a_{n}\}\)的各项按如下规律排列:\(\dfrac{2}{1}\),\(\dfrac{3}{1}\),\(\dfrac{3}{2}\),\(\dfrac{4}{1}\),\(\dfrac{4}{2}\),\(\dfrac{4}{3}\),\(\dfrac{5}{1}\),\(\dfrac{5}{2}\),\(\dfrac{5}{3}\),\(\dfrac{5}{4}\),\(…\),\(\dfrac{n+1}{1}\),\(\dfrac{n+1}{2}\),\(…\),\(\dfrac{n+1}{n}\),\(…\),则\(a_{2018}\)等于________.
\((4)\)已知函数\(f(x)=(x^{2}-3)e^{x}\),设关于\(x\)的方程\(f^{2}(x)-af(x)=0(a∈R)\)有\(3\)个不同的实数解,则\(a\)的取值范围是________.