1 . 已知函数
,函数
有四个不同的零点,从小到大依次为
,
,
,
,则
的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b10ff707fa96e4df32fec957aad831f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc9c82c1ec9a0ff6eec86178962285f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291c25fc6a69d6d0ccfb8d839b9b4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365b38a7689a8eede6820cd6f1fe952b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae30148e1e1f0f35d2be17fc42bcc413.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 设函数
,
.若
在区间
上有且只有一个零点,则实数a的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1943d73bbf353bac03ded7e9b00ab1fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22dd8b3dc4c609bab82d356a5cc2208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb788ae88e457017bb81120b6a2e5ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b8f305896ea5d78ac03c1f5e4e9f08b.png)
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3 . 已知函数
.
(1)若函数
在
上单调递增,求
的最小值;
(2)若函数
有且只有一个零点,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e651170e3a72070d3d2dd6840e4a3e.png)
(1)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4633de9335d15d7685bdecb007a3678c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b8c164755dc2d7cff80fb4c9cffc9be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/545a36ad1b772170b15fcc05c29f6326.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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4 . 已知函数
,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c177ca673c2321caa7f7a3f17b076993.png)
A.![]() | B.![]() ![]() |
C.函数![]() | D.不等式![]() |
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5 . 设函数
.
(1)当
,
时,
①求
在
处的切线方程;
②求证:当
时,
;
(2)当
时,已知
为函数
的两个零点(
为
的导数),求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5660c7eb9795d81e7854875765df29b0.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3320a13248a3a1208ff6ee85c9d26f36.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5828873f8369183faf71181cda5b61d2.png)
②求证:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcac1e85463a3177f487d896b3d1d24c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57318ea12371c9fc9a7aeba5deb1c549.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac02d94e59022a5499b6755f8d8f0b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/383c5fd6b3d4619c9292d2560046285c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724340d69477c0ec2418c392b22b1cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/936ab057c74ffcee55426a1f0d7e8e6e.png)
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6 . 已知函数
(
且
),下列说法正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f99e9cd373fdb3de30fd33ea25e0cdf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
A.当![]() ![]() |
B.当![]() ![]() |
C.当![]() ![]() |
D.存在唯一的![]() ![]() |
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7 . 已知函数
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2deed79061df676109fb6b078739c3a9.png)
A.函数![]() ![]() |
B.函数![]() ![]() |
C.对![]() ![]() ![]() ![]() |
D.若![]() ![]() |
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8 . 已知实数
,函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aabf86f0e6f92d6f48d264d275c8b70.png)
(1)证明:(i)
存在唯一的极小值点
;
(ii)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49ccf6202aa26899b445c1a3439b0ab1.png)
(2)证明:
有三个不相等的零点
,且
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e763ae04b91ef2b97333fc6da9c81ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aabf86f0e6f92d6f48d264d275c8b70.png)
(1)证明:(i)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
(ii)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49ccf6202aa26899b445c1a3439b0ab1.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b8ec9d4206ea66a02de5c4a1e1e911.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1c06068ac2d0da29abec54df3f84347.png)
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9 . 用min{
}表示
中的最小值,设函数
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2486d605e06c560cd061ee900f8904f2.png)
A.![]() | B.![]() ![]() |
C.当![]() ![]() ![]() | D.若![]() ![]() |
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10 . 已知
.
(1)当
时,求函数
的极值;
(2)当
时,设
.若函数
在
上有两个不同的零点,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/285c05daa1f0b1252049938a0b06db55.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecc7edb87aafdaee57de92e7782c1ef0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4286b787606756f22ea8c1c65882645d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17bf693f248fa14208b3b13b9122d4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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