1 . 已知定义在R上的函数f(x)=|x﹣m|+|x|,m∈N*,存在实数x使f(x)<2成立.
(1)求实数m的值;
(2)若α≥1,β≥1,f(α)+f(β)=4,求证:
≥3.
(1)求实数m的值;
(2)若α≥1,β≥1,f(α)+f(β)=4,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4810b30abe0eeed5833c4ffbc161c7b.png)
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2019-09-13更新
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179次组卷
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3卷引用:新疆生产建设兵团第二中学2019-2020学年高三上学期第一次月考数学(理)试题
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2 . 已知定义在
上的函数
,且
恒成立
(1)求实数
的值;
(2)若
,且
,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74b5070ce370431d6701e17eaaee0d66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4d0cd47609b9d1865dfff4979161cf5.png)
(1)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98f0784ce7148d8fed3dee5c508eae05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0538b39e703cc71355da6cfc5faea4e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9d61d98c3d75e65b45f98b9f41da38.png)
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2019-09-12更新
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5卷引用:重庆市江津中学、实验中学等七校2020届高三下学期6月联考(三诊)数学(文)试题
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解题方法
3 . 已知函数
的值域为
.
(1)若
,求
,
的值;
(2)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82d294828146eb7e9df1ecf90473a3b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7dcdd87d593df4a5c5e98d47fe1cfa6.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f22fec5a381ae8aca93d876e54c79de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e093a99acc5fdb85122faa2923ed8d0.png)
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4 . 已知函数f(x)=|x﹣1|﹣|x+a|(a∈N*),f(x)≤2恒成立.
(1)求a的值;
(2)若正数x,y满足
.证明:
(1)求a的值;
(2)若正数x,y满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dbfb560bef3042ac01f798bed74adb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/263497ffa223b4febc84d738931db7a9.png)
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5 . 已知函数
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4ebfef550eec07598671c5929259780.png)
(1)若
,求不等式
的解集;
(2)若函数
为偶函数,此时
的最小值为t,若实数a,b,c满足
,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/624461bef21a0afc8417de01779053d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4ebfef550eec07598671c5929259780.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eeae3d0886ea80770248bf577737c2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5143836462d67c7764fec4b0a6b4f820.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d479a86a1711709b2d100fe4daf3e7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d479a86a1711709b2d100fe4daf3e7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc52bfa6560b97109548a6a7d29deb33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/125070d1efe0732ca39e5dcedf49d22c.png)
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2020-01-02更新
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239次组卷
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2卷引用:辽宁省丹东市凤城市第一中学2019-2020学年高三上学期第一次月考数学(理)试题
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6 . 已知函数
.
(1)求函数
的最小值
;
(2)若正实数
,
满足
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d53bb5e14f7f001900d142e13e6b2d7.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若正实数
![](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/50d740b6da22bede219b13f233ad6e99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8db61a4287c7c0c47f89adaefaa5f6f6.png)
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2019-12-30更新
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238次组卷
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3卷引用:湖北省武汉市2019-2020学年高三上学期11月综合测试(二)理科数学试题
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解题方法
7 . 已知函数
.
(1)解不等式
;
(2)设函数
的最小值为m,已知正实数a,b,且
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70af7ea1e43238f46e537032b7234494.png)
(1)解不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2a8a9f4f0d6590de86becb733bd1b6b.png)
(2)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/479ed926500b142e0b43f9dd68649c78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0b591a52dad8b93a35ac898e175f554.png)
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2020-02-27更新
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502次组卷
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6卷引用:2020届湖南省长郡中学、雅礼中学等四校高三2月联考(线上)数学(理)试题
8 . 已知正数a,b,c满足
.求证:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/463f2fd2e30b12e61b1c11a201830606.png)
(2)若存在非零实数t.使得不等式
成立,求实数x的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/751e274e9107d780c39ba9c49d6daefb.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/463f2fd2e30b12e61b1c11a201830606.png)
(2)若存在非零实数t.使得不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ec303786f1404273c754a78e26b3f2.png)
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9 . 已知
是定义在
上的函数,记
,
的最大值为
.若存在
,满足
,
,
,则称一次函数
是
的“逼近函数”此时的
称为
在
上的“逼近确界”.
(1)验证
是
,
的“逼近函数”;
(2)已知
,
,
.若
是
的“逼近函数”,求a,b的值;
(3)已知
,
,求证;对任意常数a,b,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de20c8a7425e383e93647b7d491e7745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1291ecd1ed0c05219d47f05fb585bd52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90cd32efb968fbe9782f556ba6e5ae99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6d8a4cf957865fad1cb648fcd2cbaa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da3b73875f5ded5e57738d7575f085b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b03aa0579190e109d83c854ca92df1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd3fc3534440fed12137e2fdb4399bed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df2c5162ce87955c8e65cca93d1e108c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e136e7637543c8ae92c8dcd55b31924.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6d8a4cf957865fad1cb648fcd2cbaa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de20c8a7425e383e93647b7d491e7745.png)
(1)验证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b4b0eba587d0af5c665a8f909df5104.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a3a31a85f11189d8253c823f82a513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fbb01a7f5e9861aa185c6c63fcd58c0.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6201963fcdd54887f2af50518bd908a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc868a2077000982bd4594d95cfc351.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e81d5465bf23d8886f670a57a69f20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e136e7637543c8ae92c8dcd55b31924.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6201963fcdd54887f2af50518bd908a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc868a2077000982bd4594d95cfc351.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ba58ee96c397a0e865e5ec333a664bb.png)
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10 . 已知函数
.
(1)解不等式
;
(2)记函数
的最小值
,正实数
,
满足
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e32fe6eea89758fe843a869976d08fd.png)
(1)解不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4509817be39bef4bcde115996ee39e8.png)
(2)记函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/857ce2790f14cac8a0cfecc154015237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.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/9048a4655708ea1ff6702b4b5061975a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68315df908cdd2900562905342da3bdb.png)
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2019-06-15更新
|
758次组卷
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4卷引用:河北省衡水市2019届高三下学期五月大联考数学(文)试题