解题方法
1 . 已知函数
.
(1)若
在区间
上恒成立,求
的取值范围;
(2)若对于任意的
,存在
,使得
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62ff383cdcfc56e860ff24e4212c5773.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6acb0f1ac694dd177e99fc385f23318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e11f4ca0e7ace69f92130d0525bcdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)若对于任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3968f4695b3c6a0f4e527c59e746baad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e16014834857c7ad49afc420095b5239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa4d2639198a3eaa926430faf26048e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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名校
解题方法
2 . 若函数
满足对任意的![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00e4408cd4f9e77920b85f430c51587c.png)
,都有
成立,则称函数
在区间![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f1a84f56a0ab988ba2b1149b633dac1.png)
上是“被
约束的”.若函数
在区间![](https://staticzujuan.xkw.com/quesimg/Upload/formula/931c89d6bea8004d7f84aa76de13c11a.png)
上是“被
约束的”,则实数
的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00e4408cd4f9e77920b85f430c51587c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf60e47babed97e07f8040f6fb956bae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d2b0f97dd967e052dd52c68a0d9a058.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f1a84f56a0ab988ba2b1149b633dac1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf60e47babed97e07f8040f6fb956bae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6881c195325fdfa0fb3c5f57093cea55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/931c89d6bea8004d7f84aa76de13c11a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bf8197e4f3fd18815045d29c357a863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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3 . 若正实数
满足
,且不等式
恒成立,则实数
的取值范围是___________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e079ad8d784a4ccbed80838f2c4ebc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03e2e3516b299c133251934d5468c48a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
2016-12-03更新
|
942次组卷
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6卷引用:2015届重庆市第一中学高三上学期期中考试理科数学试卷
2015届重庆市第一中学高三上学期期中考试理科数学试卷2015届浙江省永康明珠学校高三上学期期中考试理科数学试卷2016届浙江省富阳市二中高三上学期第二次质量检测理科数学试卷河南省南阳市第一中学2018届高三第一次考试(8月)数学(理)试题(已下线)上海市华东师范大学第二附属中学2019-2020学年高一上学期期中数学试题上海市闵行区七宝中学2016-2017学年高三上学期期中数学试题
2012·山东·二模
4 . 已知二次函数
,满足:对任意实数
,都有
,且当
时,有
成立,又
,则
为
![](https://img.xkw.com/dksih/QBM/2012/6/23/1570895577505792/1570895582830592/STEM/6d251f724030419ea549299bf8c443d1.png)
![](https://img.xkw.com/dksih/QBM/2012/6/23/1570895577505792/1570895582830592/STEM/3de7c9c5392147e1aa7c4e291782a227.png)
![](https://img.xkw.com/dksih/QBM/2012/6/23/1570895577505792/1570895582830592/STEM/df7d8cb034c642838b2c003ddc68037a.png)
![](https://img.xkw.com/dksih/QBM/2012/6/23/1570895577505792/1570895582830592/STEM/4819fd163c1f4cc1ae11f03fd86dd87b.png)
![](https://img.xkw.com/dksih/QBM/2012/6/23/1570895577505792/1570895582830592/STEM/c5f7d55dd0804ba6905e9a35b912d0c1.png)
![](https://img.xkw.com/dksih/QBM/2012/6/23/1570895577505792/1570895582830592/STEM/1baa1614b0834077bc20bbb33e487539.png)
![](https://img.xkw.com/dksih/QBM/2012/6/23/1570895577505792/1570895582830592/STEM/3f2c200571be49199c9b8648527beab6.png)
A.1 | B.![]() | C.2 | D.0 |
您最近一年使用:0次
2011·广东深圳·二模
名校
解题方法
5 . 如果对于任意的正实数
,不等式
恒成立,则
的取值范围是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5533d122aeca0cea3a5ac219169ef28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
2016-11-30更新
|
1694次组卷
|
3卷引用:2011年广东省深圳市高三级第二次调研考试数学理卷(深圳二模)
(已下线)2011年广东省深圳市高三级第二次调研考试数学理卷(深圳二模)安徽省六安市城南中学2020-2021学年高三上学期第二次月考数学(文)试题重庆市缙云联盟2021-2022学年高一上学期10月质量检测数学试题