已知函数
,
.
(1)设
,求
的最小值;
(2)证明:当
时,总存在两条直线与曲线
与
都相切.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/733515693c7ecf140d71637c24c14aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35aa5557e55367d5faa3f9da85aa0925.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd40b35b718e527ff5ff6b250e24752.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61c388166862b3ccfcc7ca749ebe5949.png)
(2)证明:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d217c7b12e12e5fb67472452518859ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a1cfb60420ff7e72c1b9d64f69ae063.png)
更新时间:2018-03-09 17:08:28
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1596b5f9415376bbf1b841e6b194d5c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9914807086e8ccf880ff1ed42305df88.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac27392eea2125f66c5a6292c94f3bc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac27392eea2125f66c5a6292c94f3bc3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fad49b03fd6c21a4d6a04bf020dec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f184ef9e0d57554e95f369c9d4bbfea1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
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