共50条信息
\(\log _{a}(MN)=\log _{a}M+\log _{a}N.(\) \()\)
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 \((\) \()\)
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\(m+n=\) \((\) \()\)
已知函数\(f\left( x \right)={{\log }_{2}}\dfrac{2\left( 1+x \right)}{x-1}\),若\(f\left( a \right)=2\),则\(f\left( -a \right)=\)_______.
已知\({{2}^{x}}=3,{{\log }_{2}}5=y\),则\(x+y\)等于 \((\) \()\)
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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