共50条信息
已知\({{\log }_{\frac{1}{2}}}a < {{\log }_{\frac{1}{2}}}b\),则下列不等式一定成立的是( )
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\((\) \()\)
设\(a > 1 > b > -1\) ,则下列不等式中恒成立的是\((\) \()\)
若\(a > 0 > b > -a\),\(c < d < 0\),则下列结论:\(①ad < bc\);\(②\dfrac{a}{d}+\dfrac{b}{c} < 0\);\(③a-c < b-d\);\(④a·(d-c) > b(d-c)\)中成立的个数是\((\) \()\)
若\(P{=}\sqrt{a}{+}\sqrt{a{+}5}{,}Q{=}\sqrt{a{+}2}{+}\sqrt{a{+}3}(a{\geqslant }0)\),则\(P{,}Q\)的大小关系是( )
将离心率为\(e_{1}\)的双曲线\(C_{1}\)的实半轴长\(a\)和虚半轴长\(b(a\neq b)\)同时增加\(m(m > 0)\)个单位长度,得到离心率为\(e_{2}\)的双曲线\(C_{2}\),则
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