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解题方法
1 . 已知不等式
的解集是
,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d7f6c9576189874a84570689b1f17b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6a593ade597bb19009f4a85500ad671.png)
A.![]() |
B.![]() |
C.不等式![]() ![]() |
D.若![]() ![]() ![]() |
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2 . 已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d0d6eaa5830781a2949cfb612dd3b10.png)
(Ⅰ)当
时,求不等式
的解集;
(Ⅱ)若正实数
满足
,函数
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d0d6eaa5830781a2949cfb612dd3b10.png)
(Ⅰ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77d55fb4f275c5f5fc4e73442ec05eb4.png)
(Ⅱ)若正实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6958278a6ad07bf8b94826d395111d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10686785e915ea64f14690567fe2d4ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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3 . 已知
.
(1)当
时,求不等式
的解集;
(2)若不等式
恒成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54137d7dfbcc6294b7940211239af1c6.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8b33cc5994177b42becfac463fd3486.png)
(2)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d58fc02c07d4d548a93fbfa97bd546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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2018-09-29更新
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1127次组卷
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5卷引用:重庆市云阳江口中学2020届高三上学期第一次月考数学(理)试题