1 . 曲线
在点
处的切线
交
轴于点
.
(1)当
时,求切线
的方程;
(2)
为坐标原点,记
的面积为
,求面积
以
为自变量的函数解析式,写出其定义域,并求单调增区间.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12be206d66e65eb92ef08bad8cd8f71d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/023178ff4f956f96c4a184118843506b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4613215a19b36d6bdfb90385e51ee71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddb54188bbb69622b5c351e2586c3f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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解题方法
2 . 已知实数
.函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b113ac11fdfe25eb18c7dc03bafcd31b.png)
(1)若函数
在区间
上存在最小值,求正数b的取值范围;
(2)对于函数
,若存在区间
,使
,求正数a的取值范围,并写出满足条件的所有区间
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b113ac11fdfe25eb18c7dc03bafcd31b.png)
(1)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1cd73ba020237a3b1ea39ef62e13a71.png)
(2)对于函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39c2438b01c90e923d6fd70d2fba328b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7423bf39b89fb0351da670d16e7f74bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db527571cfd256c515424c6f9d114284.png)
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