名校
1 . 已知函数f(x)=xlnx-ax2,a∈R.
(1)证明:当1<x<3时,
;
(2)设函数F(x)=|f(x)|(x∈[1,e])有极小值,求a的取值范围.
(1)证明:当1<x<3时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c7f197f4390616d2bfdee94fb2f15c4.png)
(2)设函数F(x)=|f(x)|(x∈[1,e])有极小值,求a的取值范围.
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2020-05-11更新
|
541次组卷
|
2卷引用:2019年全国高中数学联赛四川省预赛
2 . 已知a为实数,且对任意k∈[-1,1]当x∈(0,6]时,6lnx+x2-8x+a≤kx恒成立,则a的最大值是_____ .
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3 . 函数
的最大值为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32640b470a14c95f11b5facc3e142403.png)
A.![]() | B.1 | C.![]() | D.![]() |
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4 . 设函数
.
(1)若
在其定义域内为单调递增函数,求实数
的取值范围;
(2)设
,且
,若在
上至少存在一点
,使得
成立,求实数
的取值范围;
(3)求证:对任意的正整数
,都有
成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9e46c8aabf3375ef2fc95aa00b93455.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9413be6f2821909223cae6cfac464e91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5abd313d4e92a762fb7fb0c1cb65263d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/579e2c39e6c0a640357e3b0ccd6f954a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae17887ccf795c630b89ff5c9f72813a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
(3)求证:对任意的正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9b22b70a93c0a81b1d2bd0c3bd0932.png)
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5 . 已知方程
的所有实数根都在区间
内(其中
,且
),则
的最小值为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff5f35ac4aed68cd70a249cc8912873b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f030c36bb8786df88d401792062a4100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22c2710ccbb5ea6f98dd3470cacaf626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a46e678bf9d2df5ad4c782b3dc22f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13502d46b8563c54c09b29b20b3006a4.png)
A.1 | B.2 | C.3 | D.4 |
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6 . 已知数列
为等差数列,数列
满足
,
,
,
.
,则数列
的公差 d为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aaee408bdec05bbdfcd4b841a331e61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4835113e51ced39acb5dc41fcb8eabcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f460a5efef77b2b3554f496a3078fc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07096af3b99fd1cb11c31f19a2c6408e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fb00692a3652c44137d1ef8eff36f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
A.![]() | B.1 | C.2 | D.4 |
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7 . 函数
的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/425c84caa7abbbbe481dbbea5f99095d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 已知函数
.
(1)求函数
的单调区间;
(2)若对一切实数
,有
成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99920ea1c45dbf4ef97b5abebf4b6ceb.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若对一切实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b9bcc4918dc9a67ddb290702f8a25ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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9 . 在数列
中,
,当
时,
、
、
成等比数列.则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2675e9c22906d6a37cdd81f2d935210.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/016d94f46e502ab9a2199c7b4c93bdc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2675e9c22906d6a37cdd81f2d935210.png)
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