优优班--学霸训练营 > 知识点挑题
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            • 1.

              已知函数\(f(x)=\lg (x+1)\).

              \((i)\)若\(0 < f(1-2x)-f(x) < 1\),求实数\(x\)的取值范围;

              \((ii)\)若\(g(x)\)是以\(2\)为周期的偶函数,且当\(0\leqslant x\leqslant 1\)时,有\(g(x)=f(x)\),当\(x∈[1,2]\)时,求函数\(y=g(x)\)的解析式.

            • 2.

              已知函数\(f(x)=a^{x}(a > 0\)且\(a\neq 1)\),其图像与函数\(g(x)\)的图像关于直线\(y=x\)对称\(.\)若\(f(2)=9\),则\(g\left( \dfrac{1}{9} \right)+f(3)\)的值是____\(.\) 

            • 3. 设\(f(x)=\log _{3}(x+6)\)的反函数为\(f^{-1}(x)\),若\(〔f^{-1}(m)+6〕〔f^{-1}(n)+6〕=27\),则\(f(m+n)=\) ______ .
            • 4.

              已知\(f(x)\)的图象与\(g(x)=(\dfrac{1}{2} )^{x}\)的图象关于直线\(y=x\)对称,那么\(f(2x-x^{2})\)的值域是

              A.\(R\)             
              B.\((-∞,0)\)        
              C.\((0,+∞)\)       
              D.\([0,+∞]\)
            • 5.

              已知\(a > 1\),设函数\(f(x)=a^{x}+x-4\)的零点为\(m\),\(g(x)=\log _{a}x+x-4\)的零点为\(n\),则\(mn\)的最大值为________.

            • 6.
              设点\(P\)在曲线\(y= \dfrac {1}{2}e^{x}\)上,点\(Q\)在曲线\(y=\ln (2x)\)上,则\(|PQ|\)的最小值为\((\)  \()\)
              A.\(1-\ln \) \(2\)
              B.\( \sqrt {2}(1-\ln \) \(2)\)
              C.\(1+\ln \) \(2\)
              D.\( \sqrt {2}(1+\ln \) \(2)\)
            • 7.

              如果直线\(ax-y+2=0\)与\(3x-y-b=0\)关于直线\(y=x\)对称,则\(a\),\(b\)的值分别为(    )

              A.\(\dfrac{1}{3}\),\(6\)
              B.\(\dfrac{1}{3}\),\(-6\)
              C.\(3\),\(-2\)
              D.\(3\),\(6\)
            • 8.

              已知函数\(f\left( x \right)={{x}^{2}}-ax(\dfrac{1}{e}\leqslant x\leqslant e,e\)为自然对数的底数\()\)与\(g\left( x \right)={{e}^{x}}\)的图象上存在关于直线\(y=x\)对称的点,则实数\(a\)取值范围是\((\)   \()\)

              A.\(\left[ e-\dfrac{1}{e},e+\dfrac{1}{e} \right]\)
              B.\(\left[ 1,e-\dfrac{1}{e} \right]\)
              C.\(\left[ 1,e+\dfrac{1}{e} \right]\)
              D.\(\left[ e-\dfrac{1}{e},e \right]\)
            • 9.

              \((1)\)已知函数\(f(x)=( \dfrac{1}{3}{)}^{x} \)

              \((1)\)若\(y=f(x)\)与\(y=f^{-1}(x)\)互为反函数,求\(g(x)=f^{-1}(x^{2}+2x-3)\)的单调区间

              \((2)\)当\(x∈[-1,1]\)时,求\(y=[f(x)]^{2}-2f(x)+3\)的最大值和最小值

            • 10. \(.\) 已知函数\(f(x)=a\)\({\,\!}^{x}\)\((a > 0,a\neq 1)\)的反函数的图象经过点\(\left( \left. \dfrac{ \sqrt{2}}{2}, \dfrac{1}{2} \right. \right)\)\(.\)若函数\(g(x)\)的定义域为\(R\),当\(x∈[-2,2]\)时,有\(g(x)=f(x)\),且函数\(g(x+2)\)为偶函数,则下列结论正确的是\((\)  \()\)
              A.\(g(π) < g(3) < g( \sqrt{2})\)                   
              B.\(g(π) < g( \sqrt{2}) < g(3)\)

              C.\(g( \sqrt{2}) < g(3) < g(π)\)                   
              D.\(g( \sqrt{2}) < g(π) < g(3)\)
            0/40

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