1 . 若
、
、
且
,则一定有( )
![](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/0097ca400d4619a94c4282c1ef6ec68e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 若
且
,则一定有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e93c4cf3e3b28e6f92516b3316d8bd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
名校
3 . 已知
,
,则下列式子恒成立的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce613eaa5df46a50174085ef5d1087fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e56f4504e0f80fd031c8b5f41832e03.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2021-01-31更新
|
197次组卷
|
3卷引用:广西北海市2020-2021学年高二上学期期末教学质量检测数学试题
名校
4 . 设函数
(
).
(1)当
时,求不等式
的解集;
(2)若
恒成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c35fe08d2691051ddfc0a2c21965e9d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/502416314c8c26f8442e639ea6a5db13.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69c55aad4e22408c4d1ab66c9860b6d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解题方法
5 . 不等式
恒成立,则
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683a5287a8156a20351accdf429db2f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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6 . 不等式
恒成立,则
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683a5287a8156a20351accdf429db2f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
7 . 已知x为正数,a=-x+
,b=5x-
,用反证法证明:a,b中至少有一个不小于6.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1751f99590f9539afce484c196f719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf35027e76f8ea593f82023973d4aba3.png)
您最近一年使用:0次
解题方法
8 . 已知函数
,求不等式
的解集.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcc81b9154607309b37218fff7d02806.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/188281cc0c7af6e95c32b9bbb94ffc21.png)
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解题方法
9 . 已知函数
.
(1)当
时,求不等式
的解集:
(2)当
时,
恒成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c1b585a5cfa771fe616fe9957cc0ce7.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/188281cc0c7af6e95c32b9bbb94ffc21.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/095c5f7a3c6917839c01fd1e5654ee91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c7572463225bb3b65cb371f4496440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解题方法
10 . 已知
.
(1)解不等式
;
(2)若
、
、
均为正数,且
,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feaa7659d62afd0d2b7d5ae7e5c300a7.png)
(1)解不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3bfa8fb148ee435d66a1b24618c56f9.png)
(2)若
![](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/d848eb64686508f68f5f61bc087b5592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bfdb47e8cea8f2d4ed8ba3f5b924f01.png)
您最近一年使用:0次
2020-07-24更新
|
586次组卷
|
4卷引用:广西名校2019-2020学年高二下学期期末数学(理)试题