选修4-5:不等式选讲
设函数
,
.
(Ⅰ)解不等式
;
(Ⅱ)设函数
,且
在
上恒成立,求实数
的取值.
设函数
![](https://img.xkw.com/dksih/QBM/2016/4/20/1572599536279552/1572599542513664/STEM/de05bb044dcb4ba39553522b0e4993f2.png)
![](https://img.xkw.com/dksih/QBM/2016/4/20/1572599536279552/1572599542513664/STEM/52ba4b702ec24cd7a47bdc32e849ca31.png)
(Ⅰ)解不等式
![](https://img.xkw.com/dksih/QBM/2016/4/20/1572599536279552/1572599542513664/STEM/929d421c13eb4e8f92c45f610bd613d4.png)
(Ⅱ)设函数
![](https://img.xkw.com/dksih/QBM/2016/4/20/1572599536279552/1572599542513664/STEM/8e57090b1912413fb0aacd0f413d68bf.png)
![](https://img.xkw.com/dksih/QBM/2016/4/20/1572599536279552/1572599542513664/STEM/13285b8af90b4ab2bcf4eb837e0f9c55.png)
![](https://img.xkw.com/dksih/QBM/2016/4/20/1572599536279552/1572599542513664/STEM/172b109d5afa43dab17be18ef5c8c2f7.png)
![](https://img.xkw.com/dksih/QBM/2016/4/20/1572599536279552/1572599542513664/STEM/2efca7b1faf342c6a17fb5d867c2de44.png)
更新时间:2016-12-04 06:04:52
|
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】设函数
,
.
(1)当
时,求不等式
的解集;
(2)当
时,对于
,都有
成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c4d8471421418baf7feef04a75ebc22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03fc1cd2baabbf8afea25478e1258237.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ce655a13dea9309f8ed84036ba293aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b839eae658b612ffd245b194d7bded9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8130d4d1cf46c1998d97e4a533725a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】选修4-5:不等式选讲
已知函数
.
(Ⅰ)解不等式
;
(Ⅱ)若
,且
,求证:
.
已知函数
![](https://img.xkw.com/dksih/QBM/2015/10/27/1572268160557056/1572268166955008/STEM/aa1b831f1ade473c958c37829e283d03.png)
(Ⅰ)解不等式
![](https://img.xkw.com/dksih/QBM/2015/10/27/1572268160557056/1572268166955008/STEM/1d03c6d8e0634eb89490455fc1ed0ecb.png)
(Ⅱ)若
![](https://img.xkw.com/dksih/QBM/2015/10/27/1572268160557056/1572268166955008/STEM/0a0910dfc5004b23a15f4bbc84453aaa.png)
![](https://img.xkw.com/dksih/QBM/2015/10/27/1572268160557056/1572268166955008/STEM/686c0e976418415d82b670b79ba7e733.png)
![](https://img.xkw.com/dksih/QBM/2015/10/27/1572268160557056/1572268166955008/STEM/a797436db2cb4996b0c0597b8a323e1d.png)
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解答题-问答题
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适中
(0.65)
名校
【推荐3】已知函数
.
(1)解不等式
;
(2)设
时,函数
的最小值为M.若实数a,b,c满足
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f12f04740cecfbe3d1fa67ecb059372d.png)
(1)解不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fbc901cbdb68130ddac3174583dd93c.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb63478132d4c1fef3c17e591919da83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa5c520d506850e1bebf29a14fb871a4.png)
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您最近一年使用:0次
解答题
|
适中
(0.65)
【推荐1】选修4-5:不等式选讲
已知函数
,
.
(Ⅰ)当
时,解不等式
;
(Ⅱ)若关于
的不等式
有解,求
的取值范围.
已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5122fb2f4848dbea0547fe8eb0ff6bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab9cd3690e7aa3debb1ed054a9f622da.png)
(Ⅰ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9491f776adab0f069bbff1f7e08e1b7d.png)
(Ⅱ)若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b562ca77fa64f3ebe40e0ad49833d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐2】已知函数
的最小值为
.
(1)求
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(2)若
为正实数,且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4acc18110de9b954f026868627ef46a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de86db8a10ca4e4cd7e3f3d48aa865d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17f917a19a15bceb9a3769e59e25dd9c.png)
您最近一年使用:0次