已知
,
,(1).求证:
;
(2)若
,求证:
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4f58b9bc974b789928f6490acb43fb3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c91d326e4306f2bb26b03e187857ac2e.png)
更新时间:2021-10-22 09:40:56
|
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较易
(0.85)
名校
解题方法
【推荐2】(1)已知
,求
的取值范围.
(2)设
,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe37c8be48c29fd36f87528478ae8bd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e349aab7489f098bcea13bd5bc99a936.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e64541d7f445079207b6f671adc7d662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a0d138cbf50b7da8c88214ca6d917d8.png)
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