解答题-问答题 较难0.4 引用1 组卷1219
设
为正实数,
.
(1)试比较
的大小;
(2)若
,试证明:以
为三边长一定能构成三角形;
(3)若对任意的正实数
,不等式
恒成立,试求
的取值范围.
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944605982720/1571944611897344/STEM/10c7e57953d348dbb76febc4240f464f.png)
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944605982720/1571944611897344/STEM/4cfe31379cdc466bb964634a64c3cd91.png)
(1)试比较
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944605982720/1571944611897344/STEM/df446b36ce514c3594792a28d8391d89.png)
(2)若
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944605982720/1571944611897344/STEM/339d6701f18d437ab6b90f97a86d437c.png)
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944605982720/1571944611897344/STEM/2701b17cc53740beafce7d49eb3229bc.png)
(3)若对任意的正实数
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944605982720/1571944611897344/STEM/10c7e57953d348dbb76febc4240f464f.png)
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944605982720/1571944611897344/STEM/5c371e844f4b4bb5a06b452a80e6e72b.png)
![](https://img.xkw.com/dksih/QBM/2015/1/5/1571944605982720/1571944611897344/STEM/300a38f15c94470897e173848d3452a9.png)
14-15高二上·江苏盐城·期中
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