1 . 若关于
的不等式
的解集为
,则![](https://img.xkw.com/dksih/QBM/2016/5/31/1572672611704832/1572672617324544/STEM/ed614865082a4ef881a92a8597c7b5b9.png?resizew=25)
_______ .
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572672611704832/1572672617324544/STEM/aa422142235b49e4b299457f13148d8c.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572672611704832/1572672617324544/STEM/8d0226fd7b7440bf9b2f22bf11af0cf5.png?resizew=73)
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572672611704832/1572672617324544/STEM/0a52f0e922564daca7c70b88c6970974.png?resizew=104)
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572672611704832/1572672617324544/STEM/ed614865082a4ef881a92a8597c7b5b9.png?resizew=25)
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解题方法
2 . 设函数
.
(1)当
时,求不等式
的解集;
(2)对任意
,
不等式
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9464e28b89378eb59d2ff0fb9a35365.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66d61d5f66d68b4c4a2a25fd7103621.png)
(2)对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49354b4bd0e60bfa0b9b4fe3f41c7ebe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb63478132d4c1fef3c17e591919da83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/567681451f0b2e96f135d2f080df65e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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名校
3 . 设函数f(x)=|x﹣4|,g(x)=|2x+1|.
(1)解不等式f(x)<g(x);
(2)若2f(x)+g(x)>ax对任意的实数x恒成立,求a的取值范围.
(1)解不等式f(x)<g(x);
(2)若2f(x)+g(x)>ax对任意的实数x恒成立,求a的取值范围.
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名校
4 . 设函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5667222dc7745a18d87516bb82275f6.png)
(Ⅰ)若
,解不等式
;
(Ⅱ)记函数
的值域为
,若
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5667222dc7745a18d87516bb82275f6.png)
(Ⅰ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e732c35a5d15e0f8f0d9132b8e6f9449.png)
(Ⅱ)记函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae871ee728f679f884dd2d2135be622d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5347e2eda84313a11d1ab481d6b7767d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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2016-12-04更新
|
432次组卷
|
3卷引用:2015-2016学年福建师大附中高二下期末文科数学试卷
5 . 选修4-5:不等式选讲
(Ⅰ)求
的值;(Ⅱ)若
求证:
.
已知不等式 的解集为
.
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e3d325f31006e62d95d8290aeea4731.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/120b6fbae6d3879fa059e02e505ab8a7.png)
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名校
6 . 已知函数
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0db961e8a6aea01db729710b0596ab49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f233864bb14aff6c801af85104a8503.png)
(Ⅰ)解关于的不等式
;
(Ⅱ)若不等式对任意
恒成立,求实数
的取值范围.
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名校
7 . 设函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/898c7ce54d637b1549ffb0f30bdca2b0.png)
(1)解不等式
;
(2)若存在实数
,使得不等式
成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/898c7ce54d637b1549ffb0f30bdca2b0.png)
(1)解不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c678921233dad2692ac54dfe2588802.png)
(2)若存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea40b5e7c172414523d66395754988f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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解题方法
8 . 已知函数
.
(1)若
恒成立,求实数
的最大值
;
(2)在(1)成立的条件下,正实数
,
满足
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df3b743cb215e038746703dc9039f9c4.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b29d8a43948e858bc50fa6bca8772842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)在(1)成立的条件下,正实数
![](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/6e8762c14ba07710784f3a0d554d38ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b0e403c5f00d0357d3fa30d6c2717c.png)
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11-12高二下·福建·阶段练习
9 . 求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbe0bce507edf00d695c18c797f5752f.png)
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10 . 已知实数
,设函数
.
(Ⅰ)证明:f(x)≥2;
(Ⅱ)若
,求a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eda48853e8bdb7e266370b4e0d5a258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ec1b2b618517164e124afe15a30a7a.png)
(Ⅰ)证明:f(x)≥2;
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4b2717d5d8596e949a34fb7546bbc79.png)
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