解题方法
1 . 设函数
,则
是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f438eca2954862a6a7dc020ffeb1e9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
A.奇函数,且对任意![]() ![]() |
B.奇函数,且存在![]() ![]() |
C.偶函数,且对任意![]() ![]() |
D.偶函数,且存在![]() ![]() |
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解题方法
2 . 已知函数
,其中
.
(1)若曲线
在点
处的切线是
轴,求
的值;
(2)当
时,求证:
;
(3)若对
,
恒成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f711a74051646e18f2d72465bdc4f1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
(1)若曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5828873f8369183faf71181cda5b61d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9c599e8d420006448905acec2b8234.png)
(3)若对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e81b4aac721bcd4a49593b48a28a8f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9c599e8d420006448905acec2b8234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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3 . 已知函数
.
(1)当
时,讨论函数
的单调性;
(2)若对任意
恒有
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdf8283b4363cab74c5292f5e5f1cdae.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/030a328f9a72e0a59f5a48a3cb4e7289.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d5f829d1b00f6493e30a016941ee1bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/699f589bd63355d42a53a0d3d28ff64c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4887473a8091e1ef53a169cc9f211e3a.png)
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4 . 已知函数
的定义域为(0,+
),若
在(0,+
)上为增函数,则称
为“一阶比增函数”;若
在(0,+
)上为增函数,则称
为”二阶比增函数”.我们把所有“一阶比增函数”组成的集合记为
1,所有“二阶比增函数”组成的集合记为
2.
(1)已知函数
,若
∈
1,求实数
的取值范围,并证明你的结论;
(2)已知0<a<b<c,
∈
1且
的部分函数值由下表给出:
求证:
;
(3)定义集合
,且存在常数k,使得任取x∈(0,+
),
<k},请问:是否存在常数M,使得任意的
∈
,任意的x∈(0,+
),有
<M成立?若存在,求出M的最小值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a27e72b96bc7af66c7472a9d7370e5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e82cc461b9607e08a8b31597f6d26df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a27e72b96bc7af66c7472a9d7370e5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b581dba9cddfa758eb3a030fcc9de8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a27e72b96bc7af66c7472a9d7370e5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb9ad1e34877b0db02d0219332b0f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb9ad1e34877b0db02d0219332b0f7b.png)
(1)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/843a1dd73fb90053eeb8f5d014f9c0f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb9ad1e34877b0db02d0219332b0f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(2)已知0<a<b<c,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb9ad1e34877b0db02d0219332b0f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![]() | ![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | t | 4 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0804b72b083963cfb022c1d3d45e758.png)
(3)定义集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/951068950ea1e02576e11df1d43de9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a27e72b96bc7af66c7472a9d7370e5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47f5817ab7b88e9d8a83dd086ffdb3c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a27e72b96bc7af66c7472a9d7370e5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
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5 . 若不等式
定义任意实数
恒成立,则
的取值范围是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a45878e7ecb2874880914b8b5f55fcff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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