解题方法
1 . 已知函数
,
.
(1)求
的极值点以及极值、最值点以及最值;
(2)设
,其中
,若存在唯一的整数
,使得
,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3c82a47d1b9a0e4694643325bf3f48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f417f76e2e7eb5231d8e90fb85c5b17.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffd5dfcac1e93e91962a5efc18d43947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49394e68ffeca8ef55bfde18c7ef0d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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2 . 已知函数
.
(1)当
时;
(ⅰ)求曲线
在点
处的切线方程;
(ⅱ)求
零点的个数;
(2)当
时,直接写出a的一个值,使得
不是
的极值点,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02269a5b810c2dbe26217745ef70fb2d.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
(ⅰ)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68c6b6a11760d0724b0b60e55970e229.png)
(ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
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3 . 已知函数
,
.
(1)若
,求函数
的极值;
(2)试讨论函数
的单调性.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6641a63974cab9b40a163d9027883b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)试讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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4 . 已知函数
.
(1)求
在
处的切线方程;
(2)求
的单调区间和极值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aa85c49236e87e13bcb63df24b3b8ab.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
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5 . 已知函数
.
(1)若曲线
在
处的切线方程为
,
(ⅰ)求
和
的值;
(ⅱ)求函数
的单调区间和极值;
(2)当
时,求函数
的极值点的个数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c1745c80d9db3ac0387589f6b8f08a.png)
(1)若曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0afb80007983e5b99dcdeebf87d18ff4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa4a9b57fc3a19a572c2959a7004fe7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/481e2f9dfab04410cb6996e65c8e640c.png)
(ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(ⅱ)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d217c7b12e12e5fb67472452518859ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
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解题方法
6 . 已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adac4ee04e7bbaa6dc3f0f58915cd817.png)
(1)当
时,求
的极值;判断此时
是否有最值,如果有请写出最值(结论不要求证明)
(2)若
是单调函数,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adac4ee04e7bbaa6dc3f0f58915cd817.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f498b6874410fb46e9807e04371e6e5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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7 . 已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/141d819347adf2c2c8f2bd2c99115809.png)
(1)求函数
的极值;
(2)当
时,求证:函数
有两个零点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/141d819347adf2c2c8f2bd2c99115809.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7db8f867196410e2828e2bbd3183b02d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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8 . 已知函数
.
(1)当
时,求曲线
在
处的切线方程;
(2)求函数
的极值点;
(3)写出
的一个值,使方程
有两个不等的实数根.并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1cb662f1659b7d3b11842fc7d197b18.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
(2)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(3)写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0369099d128586f54e7d566a5cdc5686.png)
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9 . 已知函数
.
(1)当
时,求曲线
在点
处的切线方程;
(2)设
,求函数
的极大值;
(3)若
,求函数
的零点个数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e712fd8e9a66a77132794a2d7c215d.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bea9227dd0104da58e0c40952cc87ed.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74a630ae65a7d8a8ecdc0a540ad5b688.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/757e183e8ecf5368d59fe6e6d41ab92d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
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10 . 已知函数
,其中
.
(1)当
时,求
的极值;
(2)讨论当
时函数
的单调性;
(3)若函数
有两个不同的零点
、
,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/971822ac7125bb76d66139083584263f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10bbdef421c976962a270a2beabbad91.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b108ab31cc093f03cf48ad65429889e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)讨论当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
(3)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8145758226601870f0366210b150e047.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
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