2013 全国 第 10 题 单选题 区分题 2013_退役省自主命题 (2013·理) 10．已知 $a$ 为常数，函数 $f(x)=x(\ln x-a x)$ 有两个极值点 $x_{1}, x_{2}\left(x_{1} A. $f\left(x_{1}\right)>0, f\left(x_{2}\right)>-\frac{1}{2}$B. $f\left(x_{1}\right)<0, \quad f\left(x_{2}\right)<-\frac{1}{2}$C. $f\left(x_{1}\right)>0, f\left(x_{2}\right)<-\frac{1}{2}$D. $f\left(x_{1}\right)<0, f\left(x_{2}\right)>-\frac{1}{2}$ 参考答案D 查看本题 SEO 页 → 查看原卷 →