1 . 设函数
,若对任意
,都存在
,使
,则实数
的取值范围为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac61e696eac5afbd2528b01997886462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec80634a6e2b2c85f845fa368b3a5969.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ba8542fbe02e78cf3948c9abea9855.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eca5c282908fef3f0481e376f42c490.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2017-02-17更新
|
83次组卷
|
4卷引用:2017届山西省名校高三9月联考数学(文)试卷1
2017届山西省名校高三9月联考数学(文)试卷12016-2017学年湖南长沙一中高一上学期段测二数学试卷(已下线)第06练 指数函数与对数函数-2021年高考数学(理)一轮复习小题必刷2016-2017学年福建省南平市高一上学期期末质量检查数学试卷
2 . 对于函数f(x),g(x),φ(x)如查存在实数a,b使得φ(x)=a•f(x)+b•g(x),那么称φ(x)为f(x),g(x)的线性组合函数,如对于f(x)=x+1,g(x)=x2+2x,φ(x)=2﹣x2存在a=2,b=﹣1使得φ(x)=2f(x)=g(x),此时φ(x)就是f(x),g(x)的线性组合函数.
(Ⅰ)设f(x)=x2+1,g(x)=x2﹣x,φ(x)=x2﹣2x+3,试判断φ(x)是否为f(x),g(x)的线性组合函数?关说明理由;
(Ⅱ)设f(x)=log2x,g(x)=log
x,a=2,b=1,线性组合函数为φ(x),若不等式3φ2(x)﹣2φ(x)+m<0在x∈[
,4]上有解,求实数m的取值范围;
(Ⅲ)设f(x)=x,g(x)=
(1≤x≤9),取a=1,b>0,线性组合函数φ(x)使φ(x)≥b恒成立,求b的取值范围,(可利用函数y=x+
(常数k>0)在(0,
]上是减函数,在[
,+∞)上是增函数)
(Ⅰ)设f(x)=x2+1,g(x)=x2﹣x,φ(x)=x2﹣2x+3,试判断φ(x)是否为f(x),g(x)的线性组合函数?关说明理由;
(Ⅱ)设f(x)=log2x,g(x)=log
![](https://img.xkw.com/dksih/QBM/2016/3/25/1572557944938496/1572557950500864/STEM/d1b92c8f530a447aaa4cb203f70e2d5c.png)
![](https://img.xkw.com/dksih/QBM/2016/3/25/1572557944938496/1572557950500864/STEM/13ccb5c1dc27472fb55f7c2ad2e2ebc7.png)
(Ⅲ)设f(x)=x,g(x)=
![](https://img.xkw.com/dksih/QBM/2016/3/25/1572557944938496/1572557950500864/STEM/d46d5079b6a8452e911f1effa835de73.png)
![](https://img.xkw.com/dksih/QBM/2016/3/25/1572557944938496/1572557950500864/STEM/a8eb09afb3eb45209bb572043cb71eea.png)
![](https://img.xkw.com/dksih/QBM/2016/3/25/1572557944938496/1572557950500864/STEM/4df8737c8234456c9d635177399c2f99.png)
![](https://img.xkw.com/dksih/QBM/2016/3/25/1572557944938496/1572557950500864/STEM/4df8737c8234456c9d635177399c2f99.png)
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名校
3 . 已知函数
,则该函数的值域是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2e1e4aed16ae557d60a97ed8f4aead9.png)
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解题方法
4 . 已知函数
在区间
上有最小值1和最大值4.
(1)求
的值;
(2)若
,设
,若不等式
在区间
上有解,求实数
的取值范围.
![](https://img.xkw.com/dksih/QBM/2016/9/8/1573008277831680/1573008283697152/STEM/0c174845c29f4081bf1271fcb5343a0f.png)
![](https://img.xkw.com/dksih/QBM/2016/9/8/1573008277831680/1573008283697152/STEM/ebe51e4443024da68b14e98d3f8dfa64.png)
(1)求
![](https://img.xkw.com/dksih/QBM/2016/9/8/1573008277831680/1573008283697152/STEM/dc26dd99045d4de3bce44fede8893814.png)
(2)若
![](https://img.xkw.com/dksih/QBM/2016/9/8/1573008277831680/1573008283697152/STEM/765f619882ec473db87cb7c6c7645682.png)
![](https://img.xkw.com/dksih/QBM/2016/9/8/1573008277831680/1573008283697152/STEM/19065ac5ecf348cbad5d301845a1d688.png)
![](https://img.xkw.com/dksih/QBM/2016/9/8/1573008277831680/1573008283697152/STEM/a4cae866bff740a58e1d71cc404215de.png)
![](https://img.xkw.com/dksih/QBM/2016/9/8/1573008277831680/1573008283697152/STEM/b84c6ea0bf5745e78e0b28f019a22658.png)
![](https://img.xkw.com/dksih/QBM/2016/9/8/1573008277831680/1573008283697152/STEM/5330e0bc4b2142b4a8f997e15d8444c6.png)
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5 . 已知函数f(x)
是定义在[﹣2,2]上的奇函数.
(1)求a,b的值;
(2)求f(x)的值域;
(3)若对任意t∈R,x∈[﹣1,1],不等式f(x)<3t2﹣λt+1恒成立,求λ的范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24f5a5809a7d9d8cec17ce951b6ebcbe.png)
(1)求a,b的值;
(2)求f(x)的值域;
(3)若对任意t∈R,x∈[﹣1,1],不等式f(x)<3t2﹣λt+1恒成立,求λ的范围.
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11-12高一下·山西吕梁·阶段练习
6 . f(x)=-x2+mx在(-∞,1]上是增函数,则m的取值范围是__________
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解题方法
7 . 已知
在
上的最大值为6,则
的最小值为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/906f6aab4911656e0d9efbaa69883c7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac9c64ba837387d640de4b8e2191b1b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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2016-12-04更新
|
472次组卷
|
2卷引用:2015-2016学年山西省康杰中学高二下期末文科数学试卷
8 . 已知函数
.
(1)若
,求函数
在区间
上的值域;
(2)若函数
在区间
上有最小值3,求
的值.
![](https://img.xkw.com/dksih/QBM/2016/11/21/1573163669700608/1573163676057600/STEM/0bdd60613702452d8f5a3d9db8a6f468.png)
(1)若
![](https://img.xkw.com/dksih/QBM/2016/11/21/1573163669700608/1573163676057600/STEM/01e3ac8da3754be389be23ecd108df4f.png)
![](https://img.xkw.com/dksih/QBM/2016/11/21/1573163669700608/1573163676057600/STEM/d8bfc88a06b74c318307d45a00e80c51.png)
![](https://img.xkw.com/dksih/QBM/2016/11/21/1573163669700608/1573163676057600/STEM/a60de4b707254c9e8dc3cdba61a83152.png)
(2)若函数
![](https://img.xkw.com/dksih/QBM/2016/11/21/1573163669700608/1573163676057600/STEM/d8bfc88a06b74c318307d45a00e80c51.png)
![](https://img.xkw.com/dksih/QBM/2016/11/21/1573163669700608/1573163676057600/STEM/284e55cdaefb46578bae8d68540cc29d.png)
![](https://img.xkw.com/dksih/QBM/2016/11/21/1573163669700608/1573163676057600/STEM/0cc8f30b1d8b443093197671370421eb.png)
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10-11高二下·山西吕梁·阶段练习
9 . 函数
在区间
内是减函数,则
应满足( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ae12fb3d1944ea52df2878504b53b98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75e8e1c23498053dece274fc224982d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
A.![]() ![]() | B.![]() ![]() | C.![]() ![]() | D.![]() ![]() |
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解题方法
10 . 已知函数f(x)= 4x2-kx-8在[4,10]上具有单调性,实数k的取值范围是_________
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