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1 . 若实数
满足
,求
的最小值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef6c4b95a538532c48cd53b73740aa20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b1c8ac74ca144311ce98612bf8be9bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c3836619ba47499fca6df4e5182da9d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2019-07-09更新
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1740次组卷
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2卷引用:江西省宜春市上高二中2019-2020学年高三上学期第一次月考数学(理)试题
2 . 已知函数
的值域记为集合
,函数
的值域为
,则有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e1152bfdbb3b02f4dfcb5edcc0a2cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc79ca7727be7d93cab7c4dfb7dafc68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 下列说法正确的是
A.已知命题P: ∀x∈R ,![]() ![]() ![]() ![]() ![]() |
B.设![]() ![]() ![]() |
C.函数![]() ![]() |
D.函数![]() ![]() |
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2020-01-09更新
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437次组卷
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2卷引用:江西省贵溪市实验中学2020-2021学年高二3月第一次月考数学(理)试题
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4 . 求下列函数的值域:
(1)y=
;
(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/919d355faf65a3599e3580678146736a.png)
(3)y=x+4
;
(1)y=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d038f59037d5cbe956814b3f8a771b27.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/919d355faf65a3599e3580678146736a.png)
(3)y=x+4
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f2d5affe27a653306011d33d2bb5873.png)
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2019-10-24更新
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608次组卷
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3卷引用:江西省宜春市上高二中2019-2020学年高二上学期10月月考数学试题
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5 . 求下列函数的值域:
(1)
;
(2)
;
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bacb51bec379b95a6f87b129af2a6561.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89ea238965cccc428fd472273e7dad5a.png)
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6 . 对于函数
,若存在正实数
,对于任意
,都有
,则称函数
在
上是有界函数,下列函数:
①
;②
;③
;④
;
其中在
上是有界函数的序号为________ .
![](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/7a6330540758a21f46fc7a6d1e6328d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aea232de27d21a2646fd4520ea0726bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84a7a4a037a4dfe973f1eb683d93d799.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ec5c8dcdeb8d4250a258a2f9fee0948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a5877b36b0def7389b8fb66e8491644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02a4b4cea1e5ab7d49126372b200c3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1947fd8b1e5fa9096c13256fdb3a23ed.png)
其中在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84a7a4a037a4dfe973f1eb683d93d799.png)
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