名校
1 . 已知
,
.
(1)若
,求
的取值范围;
(2)若函数
恰有两个零点,求实数a的取值范围;
(3)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b39c5d66018f0736a0457961c91e1c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17a1141aa62d95fc3b75e3d6833aaaf0.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98a3f237b03aaa5f0fb96e572706349c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/732a3c49d8680218bdcc2f39f2b4f601.png)
(3)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08180ea9d4238fd449255a0b47f3bb2f.png)
您最近一年使用:0次
解题方法
2 . 已知函数
是定义在
上的奇函数,且
图象如图所示.
(1)根据奇函数的对称性,在如图的坐标系中画出
时图象;
(2)①求当
时,
的解析式;
②说明当
时,
的单调性并用单调性定义证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0afb80007983e5b99dcdeebf87d18ff4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac87434324956e4145e38ad92a1aa95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3549d9f830745a7408e1c3c1cb3c29a6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/26/05a53d47-2ce9-4987-8317-f8ac4d606c0d.png?resizew=168)
(1)根据奇函数的对称性,在如图的坐标系中画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e541ea2f855f981c96207070683d388.png)
(2)①求当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e541ea2f855f981c96207070683d388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0afb80007983e5b99dcdeebf87d18ff4.png)
②说明当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc95bc46e0aa25342600533d9a6082.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0afb80007983e5b99dcdeebf87d18ff4.png)
您最近一年使用:0次
3 . 如图,已知函数
的图象与函数
的图象交于
两点.过
,
分别作
轴的垂线,垂足分别为
,
,并且
,
分别交函数
的图象于
,
两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/14/dc67f42f-25b2-4b0e-83a8-2939a6056676.png?resizew=201)
(1)探究线段
与
的大小关系,并证明;
(2)若
平行于
轴,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5a0e5b12b88a5ab25b639c9afab445.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/808bd2fc4b344e7669fca65b4fa122df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c61591499c836d86407c5af542ee4719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/14/dc67f42f-25b2-4b0e-83a8-2939a6056676.png?resizew=201)
(1)探究线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35ee685a6d4799b0ba7e114a3906c0c0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baa76cfd79a2ff6b28f370e54f4eb51d.png)
您最近一年使用:0次
名校
解题方法
4 . 已知过坐标原点O的一条直线与函数
的图象交于A,B两点,分别过点A,B作y轴的平行线与函数
的图象交于C,D两点.
(1)证明:点C,D,O在同一条直线上;
(2)当直线BC的斜率为0时,求点A的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f11757bca0168e9f569d42e2803d57b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2702a5539ca829b8b7a08407f0996e8a.png)
(1)证明:点C,D,O在同一条直线上;
(2)当直线BC的斜率为0时,求点A的坐标.
您最近一年使用:0次
2022-08-11更新
|
445次组卷
|
2卷引用:河南省驻马店市确山县第一高级中学2022-2023学年高二上学期期末数学试题
解题方法
5 . 对于等式
,如果将
视为自变量
,
视为常数,
为关于
(即
)的函数,记为
,那么
,是幂函数;如果将
视为常数,
视为自变量
,
为关于
(即
)的函数,记为
,那么
,是指数函数;如果将
视为常数,
视为自变量
为关于
(即
)的函数,记为
,那么
,是对数函数.事实上,由这个等式还可以得到更多的函数模型.例如,如果
为常数
(
为自然对数的底数),将
视为自变量
,则
为
的函数,记为
.
(1)试将
表示成
的函数
;
(2)函数的性质通常指函数的定义域、值域、单调性、奇偶性等,请根据你学习到的函数知识直接写出该函数
的性质,不必证明.并尝试在所给坐标系中画出函数的图象.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9a2991a3f4c7d0f4cc8e0425d8c7bd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fce04612f2dc7928760c86f67a883df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da53929a8f67b9aa3827fdbd73ebd265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca93fca4ed03556a8261286386f8abf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca02970d65fea8d2e9dab7dc060f073f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041a7c8fc017f596542c5e6ec7d1c40b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041a7c8fc017f596542c5e6ec7d1c40b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcf7ee57490ef5f04b72050592ba1436.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(1)试将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)函数的性质通常指函数的定义域、值域、单调性、奇偶性等,请根据你学习到的函数知识直接写出该函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://img.xkw.com/dksih/QBM/2022/1/17/2896474718625792/2948205426188288/STEM/3b411d2b0e7c4e518b1909a0c8656bbe.png?resizew=327)
您最近一年使用:0次
6 . 已知函数
.
(1)证明:
;
(2)若存在一个平行四边形的四个顶点都在函数
的图象上,则称函数
具有性质P,判断函数
是否具有性质P,并证明你的结论;
(3)设点
,函数
.设点B是曲线
上任意一点,求线段AB长度的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3025c3a2c23d518b088275cd348380ff.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b492f9997599d7010efc2ee1993b684a.png)
(2)若存在一个平行四边形的四个顶点都在函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
(3)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a525534689bd2701205d4ab17574c39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b129d5bd03bd4e3895dcb15bec8eedf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f786a5701dc1a8a015e8843c3360151b.png)
您最近一年使用:0次
名校
7 . 如图,过函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad431d95fa7da97a4cd7edd9fd00c867.png)
的图像上的两点A,B作
轴的垂线,垂足分别为M
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/623747614af23acfe470d77abd6c6440.png)
,线段BN与函数
,
的图像交于点C,且AC与
轴平行.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/7188dda8-086b-4386-899f-f63d73fbf2d1.png?resizew=161)
(1)当
时,求实数
的值;
(2)当
时,求
的最小值;
(3)已知
,
,若
,
为区间
内任意两个变量,且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad431d95fa7da97a4cd7edd9fd00c867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1001d707f35f5ddb3342a5cf5217f7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1f08e04cf0b6a9afea66ce590ba00b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/623747614af23acfe470d77abd6c6440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eb337fac2bafcc9a9b7deac4af72d91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c93a5878617bab653ec9468e5db2d84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37b7f326ebbd03dab115d9fdea8f351c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/7188dda8-086b-4386-899f-f63d73fbf2d1.png?resizew=161)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16a0185c011a705150ecae56361e12f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0de341c03111d7f4e10de2e854a5ddd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb3b8f3d4d53d014490076fecf7e9ab0.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8f36309b561b1cd370ac0e6834ab3ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3583896f63afa0a424a661fe908ea247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4562f3225c98cf5cb11b47d98c9cc9c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71bb7d9025a1f580408bc559b8f16f4b.png)
您最近一年使用:0次
2020-12-21更新
|
440次组卷
|
9卷引用:2016-2017学年湖北省荆州市高一上学期期末考试数学(文)试卷
2016-2017学年湖北省荆州市高一上学期期末考试数学(文)试卷重庆一中2017-2018学年高一上学期期中考试数学试卷(已下线)第三章 5.3 对数函数的图像和性质(课时作业)-2018版步步高学案导学与随堂笔记数学(北师大版必修1)人教A版(2019) 必修第一册 突围者 第四章 第四节 对数函数福建省厦门市双十中学2018-2019学年高一上学期12月月考数学试题福建省仙游县第一中学2020-2021学年高一12月月考数学试题湘教版(2019) 必修第一册 突围者 第4章 第三节 课时2 对数函数的图象与性质北师大版(2019) 必修第一册 突围者 第四章 第三节 课时2 对数函数的图象和性质(已下线)模块一 专题1 对数与对数函数(人教A)1
名校
解题方法
8 . 对于等式
(
,
),如果将a视为自变量x,b视为常数,c为关于a(即x)的函数,记为y,那么
是幂函数;如果将a视为常数,b视为自变量x,c为关于b(即x)的函数,记为y,那么
是指数函数;如果将a视为常数,c视为自变量x,b为关于c(即x)的函数,记为y,那么
是对数函数.事实上,由这个等式还可以得到更多的函数模型.如果c为常数e(e为自然对数的底),将a视为自变量x(
,
),则b为x的函数,记为y,那么
,记将y表示成x的函数为
.
![](https://img.xkw.com/dksih/QBM/2020/12/18/2616851596918784/2618798317150208/STEM/dbeba9e6-5ad3-49ec-bec1-c8b0df3602f0.png)
(1)求函数
的解析式,并作出其图象;
(2)若
且均不等于1,且满足
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fcfe7bb3f607ac047d70fea54a21aa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fce04612f2dc7928760c86f67a883df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da53929a8f67b9aa3827fdbd73ebd265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82869dad28f771d088772a2c2b08b187.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e30c903d8f8a05332af0b19e7e40df3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f3e12dc69463d61f935db6ee063558.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://img.xkw.com/dksih/QBM/2020/12/18/2616851596918784/2618798317150208/STEM/dbeba9e6-5ad3-49ec-bec1-c8b0df3602f0.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66eba129d92ede31b728e2590c4db2a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f48b7f21ec39e043bc83387c42f9f089.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74a94bd7ccb598e5da3338b22f0cb2d2.png)
您最近一年使用:0次
2020-12-21更新
|
327次组卷
|
2卷引用:江苏省南京市第十三中学2020-2021学年高一上学期期末数学试题
解题方法
9 . (一)在函数图象的学习中常常用到化归转化的思想,往往通过对一些已经学习过的函数图象的研究,进一步迁移到其它函数,例如函数
与正弦函数就有密切的联系,因为
.只需将
在
轴下方的图象翻折到上方,就得到
的图象.
(二)在研究函数零点问题时,往往会将函数零点问题转化为两个函数图象的交点问题.例如研究函数
的零点就可以转化为函数
与函数
的图象交点来进行处理,通过作图不仅知道函数
有且仅有一个零点,还可以确定零点
.这体现了化归转化与数形结合的思想在函数研究中的应用.
结合阅读材料回答下面两个问题:
作出函数
的图象;
利用作图的方法验证函数
有且仅有两个零点.若记两个零点分别为
,
,证明:
.(注:在同一坐标中作图)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/802ac9e74e56ad33f963f959137f11a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f1c1a6d9072271db164fd5a4a014df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b9643da0c0fea4f099f9a9133d6076.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/802ac9e74e56ad33f963f959137f11a0.png)
(二)在研究函数零点问题时,往往会将函数零点问题转化为两个函数图象的交点问题.例如研究函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2acd1c331f1bc3a58dbff4385c63e1b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12be206d66e65eb92ef08bad8cd8f71d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c113e5778b36df83e8bc218c429d3d18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2acd1c331f1bc3a58dbff4385c63e1b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4ad7d7815c08de91566136e54b4e8a.png)
结合阅读材料回答下面两个问题:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d426da126764af5f027b98d570475d98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bacd8926f09f3025ce27e2ac874d5ef8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffd888afdcfdb3e91a157d50f65e915e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4175feea750f86f4b35f8bc53ddd548d.png)
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解题方法
10 . 数学家已经证明:指数函数
与对数函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec003c8af0c3e2cbc3ac6007d40594a6.png)
的图象当且仅当
时有两个不同的公共点.若对任意的
,都有
恒成立,则实数
的取值范围是________ .(注:
是自然对数的底数)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95ff35f3b50966a5e3cbb0b5977af7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec003c8af0c3e2cbc3ac6007d40594a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37b93abe2a497b7ef3cb8c1b9de8492e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e98cfa2e156f2aa091be8cb3dc8f8786.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/395dc4398cb72071866b21e3be01e770.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
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