2018·上海宝山·二模
1 . 已知函数
,
的在数集
上都有定义,对于任意的
,当
时,
或
成立,则称
是数集
上
的限制函数.
(1)求
在
上的限制函数
的解析式;
(2)证明:如果
在区间
上恒为正值,则
在
上是增函数;[注:如果
在区间
上恒为负值,则
在区间
上是减函数,此结论无需证明,可以直接应用]
(3)利用(2)的结论,求函数
在
上的单调区间.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbc1bc250c8a6523a1be394ff48d4a51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f937c7606a3ab00e17e34b39144a0ad2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20339a0d8431bf4b9cc3d6bd053fe9dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c00c43b9094d46cc2fbd6b1bb3b54a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4287e3fbd7910c03606ab99d69ecc669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
(2)证明:如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd395bf0be5f825009a033303a69fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd395bf0be5f825009a033303a69fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
(3)利用(2)的结论,求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1edd23226d76c45ed7ea43c059449ae7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beabfec6edd24b67f47ccb6e3dc22785.png)
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2 . 已知函数
.
(1)判断
的单调性,并证明你的结论;
(2)求
的最大值和最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f56caab00b18e44be17d1272e8a4c32.png)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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19-20高一上·江苏·阶段练习
3 . 已知函数
是定义在
上的奇函数,且
.
(1)求
的值;
(2)判断函数
在区间
上的单调性,并用定义证明;
(3)解不等式
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5bec6e5f8997197659647dda1c6fe9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b61bb7cb94b4d06f0090df1e365667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc47f2786ed178c1bcf8ff13bfc4739.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
(2)判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b61bb7cb94b4d06f0090df1e365667.png)
(3)解不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23a8c0e96d50acaecca352e93709f78f.png)
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名校
4 . 已知函数
.
(1)若
,用定义证明
在
上是增函数;
(2)若
,且
在
上的值域是
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0edc1f271d16494975e7dbb1ab54908.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f22a4a0dd7307a1323d25331e60782d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/185262b67f0edc28a061852e2850bef2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dab3888bca7640078ccccb33437021f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a03f86f19396a3ebacb7824e116ceade.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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2019-10-29更新
|
211次组卷
|
2卷引用:福建省厦门市双十中学2019-2020学年高一上学期第一次月考数学试题
名校
解题方法
5 . 已知函数
的定义域为D,且
同时满足以下条件:
①
在D上是单调递增或单调递减函数;
②存在闭区间![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4776c85b79df196f606d3ebf3697fbc3.png)
D(其中
),使得当
时,
的取值集合也是
.那么,我们称函数
(
)是闭函数.
(1)判断
是不是闭函数?若是,找出条件②中的区间;若不是,说明理由.
(2)若
是闭函数,求实数
的取值范围.
(注:本题求解中涉及的函数单调性不用证明,直接指出是增函数还是减函数即可)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
②存在闭区间
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4776c85b79df196f606d3ebf3697fbc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b980d8446f130dfc405c196109e73ea4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a46e678bf9d2df5ad4c782b3dc22f5.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/4776c85b79df196f606d3ebf3697fbc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e02cab1add26335b3cb43d5b54c7c853.png)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e16b22f8a70465aacea1cc8878777eb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50254ea7b079bc99aa41ad6e79252df0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(注:本题求解中涉及的函数单调性不用证明,直接指出是增函数还是减函数即可)
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解题方法
6 . 已知二次函数f(x)=x2+bx+c有两个零点1和﹣1.
(1)求f(x)的解析式;
(2)设g(x)
,试判断函数g(x)在区间(﹣1,1)上的单调性并用定义证明;
(3)由(2)函数g(x)在区间(﹣1,1)上,若实数t满足g(t﹣1)﹣g(﹣t)>0,求t的取值范围.
(1)求f(x)的解析式;
(2)设g(x)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3e2e3a6de522fe661bb9b335094404e.png)
(3)由(2)函数g(x)在区间(﹣1,1)上,若实数t满足g(t﹣1)﹣g(﹣t)>0,求t的取值范围.
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2018-11-25更新
|
1022次组卷
|
5卷引用:【市级联考】福建省福州市2018-2019学年高一上学期期中联考数学试题
【市级联考】福建省福州市2018-2019学年高一上学期期中联考数学试题【校级联考】福建省福州市三校2018-2019学年高一上学期期中联考数学试题(已下线)第3章章末复习提升(课后作业,)-新教材2020-2021学年高一数学同步备课(人教B版必修第一册)(已下线)【新教材精创】第三章函数练习(2)-人教B版高中数学必修第—册(已下线)第三章 函数 本章小结
解题方法
7 . 已知函数
对任意的实数
都有
,且当
时,
.
(1)求证:函数
在
上是增函数;
(2)若关于
的不等式
的解集为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e6f5d45adf0314f93a495f037109bbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d752d8db8a05b3ec7312f6ac8b64a07.png)
(1)求证:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2628e2dd7a988cc80530e739c22b2280.png)
(2)若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cc1208e4dbd46ac63718669d6aad96b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4573b66a2dbd65dd7eb02c5912eddce8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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名校
解题方法
8 . 已知函数
的定义域为
,对于任意的
都有
,设
时,
.
(1)求
;
(2)证明:对于任意的
,
;
(3)当
时,若不等式
在
上恒定成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3ed15aa3dcc4211fb520b5b942c989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9dbe6c97e2ffd3d4dcd75d138fd95f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e541ea2f855f981c96207070683d388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be1d8c6384d7fabddb693b2b7fcdf4a.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e38fffbc7ab9882480f4faa72390e23.png)
(2)证明:对于任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb63478132d4c1fef3c17e591919da83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c73a98c1b3504e09bfbe0db849b0d24.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51e817f37f5a814e856ebc4a16d676ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c6ca5dc1d24198dff5a599ca0f1fe1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d562dc22dfb3b81d0c3f88b54d063c2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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2017-11-28更新
|
580次组卷
|
2卷引用:山西省太原市2017-2018学年高一上学期第一次测评(期中)数学试题
9 . 已知函数
的定义域为
,对于任意的
,都有
,且当
时,
,若
.
(1)求
,
的值;
(2)求证:
是
上的减函数;
(3)求不等式
的解集.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dcbca3478eae63853d2aab5332e2e56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd384d86840b7b158af41f56fe29c7d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b666663ce3537a634a3b427b418eb62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b9a961ac7e7aed0aa31509e2e40585.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f54b6a060d6c51a328341df76013bd89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cf59c5075f9e6fdf3782b6c0e528237.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
(3)求不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/903398d58cdb60b88895ddb79541b27e.png)
您最近一年使用:0次
2017-10-28更新
|
801次组卷
|
2卷引用:山东省青岛市西海岸新区胶南第一高级中学2017-2018学年高一上学期第一次月考数学试题
解题方法
10 . 已知定义在
上的函数
对任意
都有等式
成立,且当
时,有
.
(1)求证:函数
在
上单调递增;
(2)若
,解关于
的不等式
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3ed15aa3dcc4211fb520b5b942c989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9873b5c6011ec5ee552035362b86991c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/053e4e1dc1431145c998c014b8fc0c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be1d8c6384d7fabddb693b2b7fcdf4a.png)
(1)求证:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3ed15aa3dcc4211fb520b5b942c989.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28e063be56fb2ae8bd907c4766f60401.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d666242cc595865f20ae095a309d4a38.png)
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