形如
的函数称为幂指函数,幂指函数在求导时,可以利用对数法:在函数解析式两边取对数得
,两边对
求导数,得
,于是
.已知
,
.
(1)求曲线
在
处的切线方程;
(2)若
,求
的单调区间;
(3)求证:
恒成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89f89304b11c79277a8e2dbd52858d74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f094866ad3b83a2e825c69edd12c3c6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91fd30b79a397190801f73653decfa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feefee6c27b9960c38f2507edad4f7ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d6d9996c78d9d776d5740b4fc8d7aea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38052fc8d19065e2acc564d1b17f2374.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8887bc1f890d81bd4246af70423ee197.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb7df298a9364b36e079a61caec815c.png)
(3)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b68ac4db37450fc8ecf4ca5bffb38dd4.png)
18-19高二下·江苏连云港·期中 查看更多[3]
更新时间:2020-04-18 10:05:42
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