1 . 已知f(x)=|2x-1|+2|x+1|
(1)求函数f(x)的最小值;
(2)若f(x)的值域为M,当t∈M时,证明t2+1≥
+3t.
(1)求函数f(x)的最小值;
(2)若f(x)的值域为M,当t∈M时,证明t2+1≥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f988cb6459917cd031960e6cc37bd9e.png)
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解题方法
2 . 设不等式
的解集为M,
.
(1)证明:
;
(2)若函数
,关于x的不等式
恒成立,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8e629ba04180e6c8041a8c2725e2f10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a2b85186925658e66d8541a5645269e.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cb970715ba0239eae31b19b9874373.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffb3e512a4eb1ddfdec49d7181c55caa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c40cf5ab800b6c8ef114e5ea39cfab36.png)
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2020-07-11更新
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2卷引用:黑龙江省大庆铁人中学2020届高三考前模拟训练文科数学试题
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解题方法
3 . 已知不等式
对于任意的
恒成立.
(1)求实数
的取值范围;
(2)若
的最大值为
,且正实数
、
、
满足
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bbd9e88fa8b510e4d94348bc755d7ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
(1)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989680e6b74504b71f5ece8771c5301d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/635bd350e542c66dbb2e96187c5ec047.png)
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2020-06-09更新
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3卷引用:云南省曲靖市2020届高三年级第二次教学质量监测数学(文科)试题
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解题方法
4 . 函数
,其中
,
,
.
(1)当
时,求不等式
的解集;
(2)若
的最小值为3,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aab687eba45f4795f21b2f99ddc2746.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cec12441802f71e803efaf2c62ee588.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd7126d6d76248996a222631cc9ea93c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b562ca77fa64f3ebe40e0ad49833d5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2219d312e275702451d6323cd3e7ac67.png)
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2020-06-08更新
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269次组卷
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3卷引用:江西省名师联盟2020届高三5月联考理科数学试题
解题方法
5 . 已知函数
的最大值为2.
(1)求实数m的值;
(2)若a,b,c均为正数,且
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf96902764b635b1979bd420074e92a0.png)
(1)求实数m的值;
(2)若a,b,c均为正数,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3539640e5344567a1071b64751cecc8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8720d2743b33079a807740dc0d761ad.png)
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解题方法
6 . 已知函数
的最大值为
.
(1)求
的值;
(2)已知
、
、
为正数,且
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/705a121ba6ec1be81778c26340cdaff4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)已知
![](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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989680e6b74504b71f5ece8771c5301d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c443e84586e9408cda8a9d75ef801f2.png)
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2020-07-02更新
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108次组卷
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3卷引用:广东省深圳外国语学校2019-2020学年高三下学期4月月考数学(理)试题
名校
解题方法
7 . 已知函数
.
(1)当
时,解不等式
;
(2)若
,
,
的最小值为1,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4ffac4ed594636b076cb4cc9e18f102.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41bcf1825497d48d0e05ea938f5fc5a0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0acea2598d26b89da69d9e43c6c285f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c38d31b4dd0a6e6cb7918eafe55db9.png)
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解题方法
8 . 已知函数
(其中实数
).
(Ⅰ)当
,解不等式
;
(Ⅱ)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655d0d1d7e2018282bef9fb81de1368.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
(Ⅰ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abdaffa9c15517afe6d7ba6488f88f67.png)
(Ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78daca5678cd91ea3d27b44381ba4ab9.png)
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2020-05-25更新
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511次组卷
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7卷引用:2020届安徽省淮南市高三第二次模拟考试理科数学试题
2020届安徽省淮南市高三第二次模拟考试理科数学试题安徽省淮南市2020届高三下学期第二次模拟考试文科数学试题2020届安徽省安庆市高三下学期第三次模拟数学(理)试题2020届安徽省安庆市高三下学期第三次模拟数学(文)试题安徽省淮北市第一中学2020届高三下学期第八次月考数学(理)试题黑龙江省大庆市第四中学2020届高三下学期第四次检测数学(理)试题(已下线)专题07 《不等式》中的解答题压轴题(1)-2021-2022学年高一数学上册同步培优训练系列(苏教版2019)
9 . 已知函数
.
(1)若
恒成立,求实数
的最大值:
(2)记(1)中的
最大值为
,正实数
、
满足
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3e66aa8e2497ffa025305b642a06f80.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aaee11552fe4c0863c104364d923359.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)记(1)中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/6e8762c14ba07710784f3a0d554d38ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b0e403c5f00d0357d3fa30d6c2717c.png)
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解题方法
10 . 已知函数
是奇函数.
(1)求
,并解不等式
;
(2)记
得最大值为
,若
、
,且
,证明
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d11cbb0233bae1a97f29f6ebd87d969.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e99f6241f03f76761403af0c53d3a0f1.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d285a4c557fc9748105b62ccd94b7859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f96105f1639c6566db428c91b7f1a7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39dc86044cf2704cdcebf9d6d42703b4.png)
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2020-06-19更新
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423次组卷
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3卷引用:福建省厦门市2020届高三毕业班(6月)第二次质量检查(文科)数学试题