共50条信息
已知函数\(f(x)=|\lg x|\),\(a > b > 0\),\(f(a)=f(b)\),则\(\dfrac{{a}^{2}+{b}^{2}}{a-b} \)的最小值等于 \((\) \()\)
已知\(f(x)\)是定义在\(R\)上的周期为\(2\)的函数,当\(x∈(-1,1]\)时,\(f(x)=\begin{cases} -4x^{2}+ \dfrac{9}{8},-1 < x\leqslant 0, \\ \log _{2}x,0 < x\leqslant 1, \end{cases}\),则\(f(f( \dfrac{7}{2}))=\)________.
计算:\(2^{\log }_{2}{}^{3+\log }{}_{4}{}^{3}=\)_______________.
已知\(m,n\in R\),集合\(A=\left\{ 2,{{\log }_{7}}m \right\}\),集合\(B=\left\{ m,n \right\}\),若\(A\cap B=\left\{ 0 \right\}\),则\(m+n=\) \((\) \()\)
已知定义域为\(R\)的偶函数\(f(x)\)在\([0,+∞)\)上是增函数,若实数\(a\)满足\(f(\log _{2}a)+f(\log _{0.5}a)\leqslant 2f(1)\),则实数\(a\)的最小值是 \((\) \()\)
如果\(\lg 2=m,\lg 3=n,\)则\(\dfrac{\lg 12}{\lg 15}\)等于 \((\) \()\)
.已知\(x > \)\(1\),则\(\log \)\({\,\!}_{x}\)\(9+\)\({\log }_{27}x \)的最小值是
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