解题方法
1 . 已知f(x)=
,
.
(1)若b≥1,求证:函数f(x)在(0,1)上是减函数;
(2)是否存在实数a,b,使f(x)同时满足下列两个条件:
①在(0,1)上是减函数,(1,+∞)上是增函数;
②f(x)的最小值是3.若存在,求出a,b的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b78c8c3b4e6038f13d6bfe0fe4213c8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0048e4b37ff9dee9712a48c528e6b1a.png)
(1)若b≥1,求证:函数f(x)在(0,1)上是减函数;
(2)是否存在实数a,b,使f(x)同时满足下列两个条件:
①在(0,1)上是减函数,(1,+∞)上是增函数;
②f(x)的最小值是3.若存在,求出a,b的值;若不存在,请说明理由.
您最近一年使用:0次
2016-12-03更新
|
372次组卷
|
3卷引用:2015-2016学年广东省东莞南开实验学校高一下学期期初考试数学试卷
12-13高一上·浙江嘉兴·期中
2 . 已知函数
,
(1) 求证:
在
上为增函数; (2)当
,且
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4063691d2a8f121a655a8c6aa1a58d94.png)
(1) 求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7dcdd87d593df4a5c5e98d47fe1cfa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e14206c7d228a7c2259a7b27da8813.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f94345694d4215284c41f87146795ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f7266b2ef457b8ddeee3fa2cc24022e.png)
您最近一年使用:0次
解题方法
3 . 已知函数
.
(1)判断函数
在区间
和
上的单调性(不必证明);
(2)当
,且
时,求
的值;
(3)若存在实数
,使得
时,
的取值范围是
,
求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fa227c11b63f18792c94265c8cf2452.png)
(1)判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f26f6cc6cf7d49eeffa37036436bc54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73f0a7f52eb82472cce50381cbed1c16.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e14206c7d228a7c2259a7b27da8813.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f94345694d4215284c41f87146795ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f7266b2ef457b8ddeee3fa2cc24022e.png)
(3)若存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25c90ddcd8f9815d080848ab860d1225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70128385b9ab66ac44614af35a0dcdce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/254cf38cf25199e307b85d19a3c456b4.png)
求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f7266b2ef457b8ddeee3fa2cc24022e.png)
您最近一年使用:0次
10-11高一上·浙江绍兴·期中
解题方法
4 . 已知函数
有如下性质:如果常数
,那么该函数在
上是减函数,在
上是增函数.
(1)如果函数
在
上是减函数,在
上是增函数,求
的值;
(2)证明:函数
(常数
)在
上是减函数;
(3)设常数
,求函数
的最小值和最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/325cd3e57465c5cc93f068c94c2b8f7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eda48853e8bdb7e266370b4e0d5a258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb43c038f26d80cb49b3c6212228f96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90c61935827a2fae8f394e49ee487e7c.png)
(1)如果函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0057729a7b33fb613e4362c266ac881.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6d65618fd98232687a41f0c2ee4d1a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/814f370071f9c08eef3fe02bf54502c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)证明:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/325cd3e57465c5cc93f068c94c2b8f7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eda48853e8bdb7e266370b4e0d5a258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb43c038f26d80cb49b3c6212228f96.png)
(3)设常数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2c7b30a49c8982cf5b61b1ecbde296.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdafd7aa9b151014770f2cd5d7cf1f50.png)
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11-12高一上·江苏无锡·期中
解题方法
5 . 设函数
,常数
.
(1)若
,判断
在区间
上的单调性,并加以证明;
(2)若
在区间
上的单调递增,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91eb53e14d720bd80f822ed9e779564d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3be362dec96173f246ff747264007817.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500d68f2678989a5ce7431cfd51b019d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dccf1f9faac56117d6d3dd1dddd286d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dccf1f9faac56117d6d3dd1dddd286d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
6 . 已知函数
,
,且
.
(1)证明函数
在区间
上是增函数;
(2)设函数
. 若区间[2,5]是
的一个单调区间,
且在该区间上
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf7590785d8ee40f3d7206d4aa819265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b8c164755dc2d7cff80fb4c9cffc9be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df2817c52144d06555e98131b5e657c4.png)
(1)证明函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed6d804ef44bfc64f824b0ccef71765e.png)
(2)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ad24b182074510c1952e5948a6f8230.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
且在该区间上
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eee31b9dffcd91ff2f5477410bc09f95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
11-12高一上·北京·期中
7 . 已知函数
,
.
(1)当
时,判断并证明函数的单调性并求
的最小值;
(2)若对任意
,
都成立,试求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8b59dc951a5f0a79b2d3a4ea980a57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97148e04ca6a9f9dca0aba91ce4e1d84.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b108ab31cc093f03cf48ad65429889e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97148e04ca6a9f9dca0aba91ce4e1d84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c73a98c1b3504e09bfbe0db849b0d24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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2011·江苏南京·一模
名校
8 . 对于函数
,
,如果
是一个三角形的三边长,那么
也是一个三角形的三边长, 则称函数
为“保三角形函数”.
对于函数
,
,如果
是任意的非负实数,都有
是一个三角形的三边长,则称函数
为“恒三角形函数”.
(1)判断三个函数“
,
,
(定义域均为
)”中,哪些是“保三角形函数”?请说明理由;
(2)若函数
,
是“恒三角形函数”,试求实数
的取值范围;
(3)如果函数
是定义在
上的周期函数,且值域也为
,试证明:
既不是“恒三角形函数”,也不是“保三角形函数”.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66692ec49a458f9e48c7315d03dfc37b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/699d32dbd2b31b313ae7154c9a072775.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
对于函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1938c093dd2fbcb752d0eb7a18d143b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac4cbc7b067862a3d9c6789b392fc068.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f56f06476e9561c98011c8b85d3b2c24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
(1)判断三个函数“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38e00b49aa78de649f34d8bb9d5179ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dac9ccfe180d478d9f3c00a8eac618c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4258a513f02771aaa29037be197928b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66692ec49a458f9e48c7315d03dfc37b.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d79fd8146283ba9554e12a858499cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac4cbc7b067862a3d9c6789b392fc068.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(3)如果函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a813b5adbf5c7082561237894ba6d599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d562dc22dfb3b81d0c3f88b54d063c2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d562dc22dfb3b81d0c3f88b54d063c2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a813b5adbf5c7082561237894ba6d599.png)
您最近一年使用:0次
名校
9 . 已知定义在区间
上的函数
,其中常数
.
(1)若函数
分别在区间
上单调,试求
的取值范围;
(2)当
时,方程
有四个不相等的实根
.
①证明:
;
②是否存在实数
,使得函数
在区间
单调,且
的取值范围为
,若存在,求出
的取值范围;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c9eca1510647f9b40cf7ce69c3757f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26337502f8a07b4655416be99c2c09b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fff6e7e2b9f2b68b1647f6350b98dc8.png)
(1)若函数
![](https://img.xkw.com/dksih/QBM/2017/10/10/1792483540934656/1793041726971904/STEM/6318e0e1e1f84a3da44c6ac2c1beaef2.png?resizew=36)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28e670e88873b35b46ad6d193d8a55e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2a51944c720568f35d443589dfc1aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9c0d827ef8598ba6b70b34b2bdcd1e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8ccd22fd0ca1a8e1468329284f91b6a.png)
①证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d16df3112ff53691d26bca57f85cdc3b.png)
②是否存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://img.xkw.com/dksih/QBM/2017/10/10/1792483540934656/1793041726971904/STEM/6318e0e1e1f84a3da44c6ac2c1beaef2.png?resizew=36)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f030c36bb8786df88d401792062a4100.png)
![](https://img.xkw.com/dksih/QBM/2017/10/10/1792483540934656/1793041726971904/STEM/6318e0e1e1f84a3da44c6ac2c1beaef2.png?resizew=36)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad8af7bed124f00c8e19b52d028b4d90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
2016-12-03更新
|
1139次组卷
|
4卷引用:2015-2016学年湖北宜昌市一中高一上期中考试数学试卷
解题方法
10 . 已知![](https://img.xkw.com/dksih/QBM/2015/11/16/1572289298104320/1572289303502848/STEM/377feac7aa2f4ee3ab71a8dc053a6d0e.png)
(1)判断
在
上的单调性,并证明.
(2)设
,且
在
上是单调函数,求
的取值范围.
![](https://img.xkw.com/dksih/QBM/2015/11/16/1572289298104320/1572289303502848/STEM/377feac7aa2f4ee3ab71a8dc053a6d0e.png)
(1)判断
![](https://img.xkw.com/dksih/QBM/2015/11/16/1572289298104320/1572289303502848/STEM/59d6f36ce763402a858a552f5cb1739b.png)
![](https://img.xkw.com/dksih/QBM/2015/11/16/1572289298104320/1572289303502848/STEM/592a7e29d87d4222b9000e9570915d41.png)
(2)设
![](https://img.xkw.com/dksih/QBM/2015/11/16/1572289298104320/1572289303502848/STEM/8aff93ccd3b547c78fce9c4b946dc1ad.png)
![](https://img.xkw.com/dksih/QBM/2015/11/16/1572289298104320/1572289303502848/STEM/87edbff709c6446da0d9c0691268b5e9.png)
![](https://img.xkw.com/dksih/QBM/2015/11/16/1572289298104320/1572289303502848/STEM/592a7e29d87d4222b9000e9570915d41.png)
![](https://img.xkw.com/dksih/QBM/2015/11/16/1572289298104320/1572289303502848/STEM/f428e7222d834440892d4f6ff4c86436.png)
您最近一年使用:0次