优优班--学霸训练营 > 知识点挑题
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            • 1.

              记\(min\{a,b\}=\begin{cases} a\mathrm{{,}}a{\leqslant }b\mathrm{{,}} \\ b\mathrm{{,}}a{ > }b\mathrm{{,}} \end{cases}\)若\(f(x)=min\{x+2,10-x\}(x\geqslant 0)\),则\(f(x)\)的最大值为____\(.\) 

            • 2.

              \(f\left(x\right)=\begin{cases}2{e}^{x-1},x < 2 \\ {\log }_{3}\left({x}^{2}-1\right),x\geqslant 2\end{cases} \)则\(f(f(2))\)的值为\(——\).

            • 3.

              已知函数\(f(x)=\begin{cases}x+2(x\leqslant 0) \\ -x+2(x > 0)\end{cases} \)则\(f(x)\geqslant x^{2}\)的解集为\((\)    \()\)

              A.\([-1,1]\).
              B.\([-2,2]\).
              C.\([-2,1]\).
              D.\([-1,2]\).
            • 4.

              已知\(f(x)=\begin{cases} 2^{x}\mathrm{{-}}3\mathrm{{,}}x{ > }0\mathrm{{,}} \\ g\mathrm{(}x\mathrm{){,}}x{ < }0 \end{cases}\)是奇函数,则\(f(g(-2))=\)                 

            • 5.

              \(.\)设\(f(x)=\begin{cases} 1- \sqrt{x},x\geqslant 0, \\ 2^{x},x < 0, \end{cases}\)则\(f(f(-2))=(\)  \()\)

              A.\(-1\)                                                
              B.\( \dfrac{1}{4}\)

              C.\( \dfrac{1}{2}\)
              D.\( \dfrac{3}{2}\)
            • 6.

              若函数\(f(x)=\left\{\begin{matrix}3x-b(x < 1), \\ 2^{x}(x\geqslant 1)\end{matrix}\right(\quad \quad)\)若\(f(f(\dfrac{5}{6}))=4,\)则\(b=\)____________.

            • 7.

              定义\(a*b=\left\{\begin{matrix}a,(a\leqslant b), \\ b,(a > b),\end{matrix}\right(\quad \quad)\)则函数\(f(x)=1*3^{x}\)的值域是__________.

            • 8.

              已知函数\(f\left( x \right){=}\begin{cases} {}x{,}x{ > }0 \\ 3^{x}{,}x{\leqslant }0 \end{cases}\),则\(f{[}f\left( \dfrac{1}{2} \right){]}\)的值为__________.

            • 9. 已知函数\(f(x)=\begin{cases}x\;\;\;(x\geqslant 0)\;, \\ {x}^{2}\;\;(x < 0)\;,\end{cases} \)则\(f(f(-2))=\)________.
            • 10.

              定义在\(R\)上的奇函数\(f(x)\)和定义在\(\left\{ x\left| x\ne 0 \right. \right\}\)上的偶函数\(g(x)\)分别满足\(f(x)=\begin{cases} & {{2}^{x}}-1(0\leqslant x < 1) \\ & \dfrac{1}{x}(x\geqslant 1) \end{cases}\),\(g(x)={{\log }_{2}}x(x > 0)\),若存在实数\(a\),使得\(f(a)=g(b)\)成立,则实数\(b\)的取值范围是(    )

              A. \(\left[ -2,2 \right]\)
              B.\([-2,-\dfrac{1}{2}]\cup [\dfrac{1}{2},2]\)
              C.\([-\dfrac{1}{2},0)\cup (0,\dfrac{1}{2}]\)
              D.\(\left( -\infty ,-2 \right]\cup \left[ 2,+\infty \right)\)
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