优优班--学霸训练营 > 知识点挑题
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            • 1.
              已知函数\(f(x)=\begin{cases} - \dfrac{x^{2}}{4},0 < x\leqslant 4, \\ 4-2x,x > 4, \end{cases}\)函数\(h(x)(x\neq 0)\)为偶函数,且当\(x > 0\)时,\(h(x)=f(x).\)若\(h(t) > h(2)\),则实数\(t\)的取值范围为________.
            • 2.

              已知\(f(x)\),\(g(x)\)分别是定义在\(R\)上的奇函数和偶函数,且\(f(x)-g(x)=\left( \left. \dfrac{1}{2} \right. \right)^{x} \),则\(f(1)\),\(g(0)\),\(g(-1)\)之间的大小关系是________.

            • 3.

              已知函数\(f(x)\)对任意\(x∈R\)都有\(f(x+6)+f(x)=2f(3)\),\(y=f(x-1)\)的图像关于点\((1,0)\)对称且\(f(2)=4\),则\(f(22)=\)____.

            • 4.

              已知函数,\(f(x)=\begin{cases} \dfrac{1}{{e}^{x}},x < 0 \\ {e}^{x},x > 0\end{cases} \),\(g(x)=m{x}^{2} \),若关于\(x\)的方程\(f(x)+g(x)=0\)有四个不同的实数解,则实数\(m\)的取值范围是        

            • 5.

              若\(f(x)\)是定义在\(R\)上的奇函数,则\(f(-x)+f(x)=0.\)(    )

              A.\(√\)

              B.\(×\)
            • 6.
              已知偶函数\(f(x)\)在区间\([0,+∞)\)单调递增,则满足\(f(2x-1)-f( \dfrac {1}{3}) < 0\),则\(x\)取值范围是\((\)  \()\)
              A.\(( \dfrac {1}{3}, \dfrac {2}{3})\)
              B.\([ \dfrac {1}{3}, \dfrac {2}{3})\)
              C.\(( \dfrac {1}{2}, \dfrac {2}{3})\)
              D.\([ \dfrac {1}{2}, \dfrac {2}{3})\)
            • 7.

              设函数\(f(x)={{x}^{3}}+x\),\(x\in R .\)若当\(0 < \theta < \dfrac{\pi }{2}\)时,不等式\(f(m\sin θ)+f(1-m) > 0\)恒成立,则实数\(m\)的取值范围是\((\)  \()\)

              A.\((\dfrac{1}{2},1]\)
              B.\((\dfrac{1}{2},1)\)
              C.\([1,+\infty )\)
              D.\((-\infty ,1]\)
            • 8.
              定义在\(R\)上的偶函数\(f(x)\)满足\(f(x+1)=f(x-1)\),若\(f(x)\)在区间\([0,1]\)内单调递增,则\(f(-\dfrac{3}{2})\),\(f(1)\),\(f(\dfrac{4}{3})\)的大小关系为(    )
              A.\(f(-\dfrac{3}{2}) < f(1) < f(\dfrac{4}{3})\)
              B.\(f(1) < f(-\dfrac{3}{2}) < f(\dfrac{4}{3})\)
              C.\(f(-\dfrac{3}{2}) < f(\dfrac{4}{3}) < f(1)\)
              D.\(f(\dfrac{4}{3}) < f(1) < f(-\dfrac{3}{2})\)
            • 9.

              下列函数中,在\((0,+∞)\)内为递减的偶函数的是(    )

              A.\(y=x^{-1}\)
              B.\(y={{\log }_{\frac{1}{2}}}x\)
              C.\(y=2^{-x}\)
              D.\(y=x^{-2}\)
            • 10.

              设函数\(f\left(x\right)=k{a}^{x}-{a}^{-x} \), \((a > 0\)且\(a\neq 1)\)是定义域为\(R\)的奇函数.

              \((\)Ⅰ\()\) 求\(k \)的值

              \((\)Ⅱ\()\)若\(f\left(1\right) > 0 \),试求不等式\(f\left({x}^{2}+2x\right)+f\left(x-4\right) > 0 \)的解集;

              \((\)Ⅲ\()\)若\(f\left(1\right)= \dfrac{3}{2} \),且\(g\left(x\right)={a}^{2x}+{a}^{-2x}-4f\left(x\right) \),求\(g\left(x\right) \)在\(\left(1,+∞\right) \)上的最小值。

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