优优班--学霸训练营 > 知识点挑题
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            • 1.
              已知\(f(x)=x^{α}\),若\(f{{"}}(-1)=-4\),则\(α\)等于\((\)  \()\)
              A.\(4\)
              B.\(-4\)
              C.\(5\)
              D.\(-5\)
            • 2.
              已知幂函数\(f(x)=x^{a}\)的图象过点\((27,3)\),则这个函数解析式为 ______ .
            • 3.

              已知函数\(f\left( x \right)={{x}^{2-m}}\)是定义在区间\(\left[ -3-m,{{m}^{2}}-m \right]\)上的奇函数,则下列选项正确的是(    ) 

              A.\(f\left( m \right) < f\left( 1 \right)\)
              B.\(f\left( m \right)=f\left( 1 \right)\)                                   

              C.\(f\left( m \right) > f\left( 1 \right)\)
              D.\(f(m)\)与\(f(1)\)大小不确定
            • 4.

              运行如图所示的程序框图,设输出数据构成的集合为\(A\),从集合\(A\)中任取一个元素\(a\),则函数\(y=x^{a}\),\(x∈(0,+∞)\)是增函数的概率为________.

            • 5.

              若\(0 < m < 1\),则(    )

              A.\(lo{{g}_{m}}\left( 1+m \right) > lo{{g}_{m}}\left( 1-m \right)\)
              B.\(lo{{g}_{m}}(1+m) > 0\)      

              C.\(1-m > {{\left( 1+m \right)}^{2}}\)
              D.\({{\left( 1-m \right)}^{\frac{1}{3}}} > {{\left( 1-m \right)}^{\frac{1}{2}}}\)
            • 6.

              已知幂函数\(f(x){=}x^{m^{2}{-}2m{-}3}(m{∈}Z)\)的图象关于\(y\)轴对称,并且\(f(x)\)在第一象限是单调递减函数,则\(m{=}\)__________.

            • 7.

              已知\(a={{0.4}^{0.3}}\),\(b={{0.3}^{0.4}}\),\(c={{0.3}^{-0.2}}\),则\((\)   \()\)

              A.\(b < a < c\)
              B.\(b < c < a\)
              C.\(c < b < a\)
              D.\(a < b < c\)
            • 8.

              已知函数\(g\left( x \right)={lo}{{{g}}_{a}}\left( x-3 \right)+2(a > 0,a\ne 1)\)的图象经过定点\(M\),若幂函数\(f\left( x \right)={{x}^{\alpha }}\)的图象过点\(M\),则\(\alpha \)的值等于(    )

              A.\(\dfrac{1}{2}\)
              B.\(-1\)
              C.\(2\)
              D.\(3\)
            • 9.

              已知幂函数\(y=f(x)\)的图象过点\((2,\dfrac{1}{4})\),则\(f(\dfrac{1}{3})=\)________.

            • 10.

              已知幂函数\(f(x)=k·x^{α}\)的图象过点\(\left( \left. \dfrac{1}{2}, \dfrac{ \sqrt{2}}{2} \right. \right)\),则\(k+α=(\)  \()\).

              A.\( \dfrac{1}{2}\)
              B.\(1\)
              C.\( \dfrac{3}{2}\)
              D.\(2\)
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