共50条信息
已知\(f(x)\)满足对\(\forall x\in R,f(-x)+f(x)=0\),且\(∀x\geqslant 0时,f\left(x\right)={e}^{x}+m\left(为常数\right) \),则\(f(-\ln 5)\)的值为 ( )
函数\(y=x^{2}-2|x|\)的图象是\((\) \()\)
设\(f(x)\)是偶函数且在\(({-∞}{,}0)\)上满足若对任意\(x_{1}{,}x_{2}\),且\(x_{1}{\neq }x_{2}\),都有\(\dfrac{f(x_{2}){-}f(x_{1})}{x_{2}{-}x_{1}}{ < }0\),且\(f({-}1){=}0\)则不等式\(xf(x){ > }0\)的解集为\((\) \()\)
下列命题中是假命题的是 ( )
已知函数\(f(x)=3^{x}-\left( \left. \dfrac{1}{3} \right. \right)^{x} \),则\(f(x)(\) \()\)
函数\(y=f(x)\)在\(x∈[-2,2]\)上的图象如图所示,则当\(x∈[-2,2]\)时,\(f(x)+f(-x)=\)________.
已知定义在\(R\)上的函数\(f\left( x \right)={{2}^{\left| x-m \right|}}-1\left( m\in R \right)\)为偶函数,记\(a=f\left( -2 \right),b=f\left( {{\log }_{2}}5 \right)\),\(c=f(2m),则a,b,c \)的大小关系为
下列函数中,既是偶函数又在\((0{,}{+∞})\)上单调递增的是\(({ })\)
已知函数\(f(x)=\ln \dfrac{1+x}{1-x}\)的定义域为集合\(A\),集合\(B=(a,a+1).\) 且\(B\subseteq A\),
\((1)\)求实数\(a\)的取值范围;
\((2)\)求证:函数\(f(x)\)是奇函数但不是偶函数.
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