共50条信息
已知函数\(f(x)=x^{2}+2x+1-2^{x}\)，则\(y=f(x)\)的图象大致为\((\) \()\)
已知\(f(x)\)是定义在\(R\)上的奇函数，对任意两个不相等的正数\(x_{1}\)、\(x_{2}\)都有\(\dfrac{{x}_{2}f({x}_{1})−{x}_{1}f({x}_{2})}{{x}_{1}−{x}_{2}} < 0 \)，记\(a= \dfrac{f({4.1}^{0.2})}{{4.1}^{0.2}} \)，\(b= \dfrac{f({0.4}^{2.1})}{{0.4}^{2.1}} \)，\(c= \dfrac{f({\log }_{0.2}4.1)}{{\log }_{0.2}4.1} \)，则\((\) \()\)
．已知\(a > \)\(0\)，\(b > \)\(0\)，\(ab=\)\(8\)，则当\(a\)的值为 时，\(\log _{2}\)\(a\)\(·\log _{2}(2\)\(b\)\()\)取得最大值．
函数\(f(x)=\ln \left({x}^{2}-2x-8\right) \) 的单调递增区间是\((\) \()\)
若当\({{a}_{0}}\)时，函数\(f\left( x \right)={{a}^{\left| x \right|}}\)始终满足\(0 < \left| f\left( x \right) \right|\leqslant 1\)，则函数\(y={lo}{{{g}}_{a}}\left| \dfrac{1}{x} \right|\)的图象大致为\((\) \()\)
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