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Gaokao Math Practice Question

若函数 $f(x)=x^{2}+a x+x$ 在 $\left(\frac{1}{2},+\infty\right)$ 是增函数, 则 $a$ 的取值范围是 ($\qquad$)

  1. A.$[-1,0]$
  2. B.$[-1,+\infty)$
  3. C.$[0,3]$
  4. D.$[3,+\infty)$

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