共50条信息
设\(f\left(x\right)=\begin{cases}{\left(x-a\right)}^{2},x\leqslant 0 \\ x+ \dfrac{1}{x}+a+4,x > 0\end{cases} \)，若\(f\left(0\right) \)是\(f\left(x\right) \)的最小值，则\(a\)的取值范围为( )
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