已知函数
在
上有最大值1和最小值0,设
.
(1)求m,n的值;
(2)若不等式
上有解,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55ee790b78ea7e9fb475df3a3f56c5d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9210e75c35fb455d0446eb7ddba7d79c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba94b35258a2fbde34d7e26be524fb6e.png)
(1)求m,n的值;
(2)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7195aa6983a4cd2d3b6d0b1d28546c13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
更新时间:2019-03-16 10:05:32
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【推荐1】已知函数
对一切实数
都有
成立,且
.
(1)求
的值
(2)求
的解析式
(3)若
,对任意的
,总存在
,使得
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65aa1f8f280839490bb4e4394bd75b16.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f54b6a060d6c51a328341df76013bd89.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e813129cd0c610ce3d0e1c58883561a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/124d00e5f6aecf4d01542b5bb8a89098.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7caed051fe2a03deacbc204f0908873.png)
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解答题-证明题
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【推荐2】已知二次函数
满足
,且
对一切实数
恒成立.
(1)求
;
(2)求
的解析式;
(3)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87a5c5e106845cc7549bc3473818d31f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f20326d3816328babae38e1e7c0f29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ce6155e181e21ce56ea658b70f8af17.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(3)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce9d72f1cfd3f8df38f2050df5eb5c7.png)
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解题方法
【推荐1】设函数
是定义域为R的奇函数
(Ⅰ)若
,试判断函数单调性并求使不等式
在定义域上恒成立的
的取值范围;
(Ⅱ)若
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在
,
上最小值为
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041622d72d3ba99cd15524da8617679e.png)
(Ⅰ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75f54ecfa11026d97c8d315e55e0d34a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e430ecadf733b60dbe173dd4ce8b5734.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c85886dad735d5b8048ba3d3eab4ce4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683a34e929399278f319421486390cd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f124fb9eab689c537bb5ddf5012e35f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7ddb5245cbaa046b6e554dcb540a88.png)
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解题方法
【推荐2】已知
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上的奇函数和偶函数,且
.
(1)求
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(2)若
时,对一切
,使得
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7694c3554c62be2071931082deea2ff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3ed15aa3dcc4211fb520b5b942c989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb5e7efc484a55b43f93a2de62586fdf.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7694c3554c62be2071931082deea2ff9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200f24e682c93e02a87f3f9d57dc5d40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7e1cd5fe7b6f102446f4d19749916a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edb3e1a49c88c7dc9fffd3bd1bbd2278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐3】已知
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在区间
上的减函数,且在区间
上是增函数.
(1)求函数
的解析式;
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,问是否存在实数
,使得
在区间
上有最小值为
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的值;若不存在,说明理由.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caef851640adfb3514851b0225e7114b.png)
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(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f946cc4d49a1962b16949b6e27e104f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a5025bc3262ec8deca6242d01a1dc45.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a813b5adbf5c7082561237894ba6d599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb87c830a03204a5b783ad4c2ba49c4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
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【推荐1】已知函数
,
,定义函数
.
(1)设函数
,
,求函数
的值域;
(2)设函数
,
,当
时,恒有
,求实常数t的取值范围;
(3)设函数
,
,k为正常数,若关于x的方程
(b为实常数)恰有三个不同的解,求k的取值范围及这三个解的和(用k表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1938c093dd2fbcb752d0eb7a18d143b2.png)
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(1)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66af78df39959ad44d45a78180b4406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f4d924f38e53fb0346c93d24d873a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f5a90aeba435af22d6bcdb7b91650b8.png)
(2)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adfe1836fa9a55cc7d7a8b3d0a978336.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2babf138586dd7b8c246074a321cee17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00879cffccc124857ca755a8c345e45f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd9cadcbc109026959badc27568edf6.png)
(3)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/595f3e50fa0d95d0ea4e3f7bcbcf1086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecca8bacf273f34ac4b7ddedd4cc04cc.png)
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解题方法
【推荐2】如果函数
满足在集合
上的值域仍是集合
,则把函数
称为
函数.例如:
就是
函数.
(1)下列函数:①
,②
,③
中,哪些是
函数(只需写出判断结果)?
(2)判断函数
是否为
函数,并证明你的结论.
(3)证明:对于任意实数a,b,函数
都不是
函数.
(注:“
”表示不超过x的最大整数)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a227a694dc404d1184578c7d278fd8d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a227a694dc404d1184578c7d278fd8d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efd775c2847343e16cdca2a574eb77ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a18ca67c2770b98f36dbfd802595a95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efd775c2847343e16cdca2a574eb77ad.png)
(1)下列函数:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344ccbf79da6ad7e3709d6fa72efb756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0e212cdbfba6610bc55df2c1a737407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acd6674988e75e51f16f42fa1778d0c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efd775c2847343e16cdca2a574eb77ad.png)
(2)判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e8219ac3bf37574ded5ec32f8ebcb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efd775c2847343e16cdca2a574eb77ad.png)
(3)证明:对于任意实数a,b,函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1b72fd321d1a177cb141337cd43f8d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efd775c2847343e16cdca2a574eb77ad.png)
(注:“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2ab85825d4a002600ca41bd3cd2ee7d.png)
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