共50条信息
下列各式正确的是( )
当\(0 < x\leqslant \dfrac{1}{2}\)时,\(4^{x} < \log _{a}x\),则\(a\)的取值范围是\((\) \()\)
已知\(a={{5}^{{lo}{{{g}}_{2}}3.4}}\),\(b={{5}^{{lo}{{{g}}_{4}}3.6}}\),\(c={{\left( \dfrac{1}{5} \right)}^{{lo}{{{g}}_{3}}0.3}}\),则\((\) \()\)
已知\(f(x)\)是定义在\(R\)上的偶函数,且\(f(x+2)=f(x)\)对\(x∈R\)恒成立,当\(x∈[0,1]\)时,\(f(x)=2^{x}\),则\(f\left( \mathrm{{-}}\dfrac{9}{2} \right)=\) \((\) \()\)
已知\({{2}^{x}}=3,{{\log }_{2}}5=y\),则\(x+y\)等于 \((\) \()\)
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