共50条信息
已知函数\(f(x)=\begin{cases} & {{x}^{2}}+x,\ \,\,\,-2\leqslant x\leqslant c, \\ & \dfrac{1}{x},\quad \ \ \ \ \ \,\,c < x\leqslant 3. \end{cases}\) 若\(c=0\),则\(f(x)\)的值域是____;若\(f(x)\)的值域是\([-\dfrac{1}{4},2]\),则实数\(c\)的取值范围是____.
设函数\(f(x)=\left\{ \begin{array}{*{35}{l}} \sqrt{x}, & 0\leqslant x\leqslant a, \\ {{\log }_{3}}x, & x > a, \\ \end{array} \right.\) 其中\(a > 0\).
\(①\) 若\(a=3\),则\(f[f(9)]=\)____;
\(②\) 若函数\(y=f(x)-2\)有两个零点,则\(a\)的取值范围是______________.
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