名校
1 . (1)已知
、
、
是正数,且满足
,证明
;
(2)已知
,求
的最小值.
![](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/56667aabbe787eb1c3189d487d203e22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3681a97ebef383e8968347548102fb49.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09568754a8422dd90e9cb040b4c70544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f352f97803f55b21c0dd569caa4956f9.png)
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2 . 下列四个不等式:①
;②
;③
;④
,其中恒成立的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ae2944b3bd23260f621305ebf38426f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70db0e324f844b7ba64f700b15440cb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34f9cdd50ca8bbd25654b1e671a3759f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94e0bb620fda3f5e71400632b22a8c5d.png)
A.1 | B.2 | C.3 | D.4 |
您最近一年使用:0次
名校
3 . 已知
,设
:实数
满足
,
:实数
满足
.
(1)若
,且
为真,求实数
的取值范围;
(2)若
是
的必要不充分条件,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebff6619f0334a3494d94c6cacf2f2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e131db7391bc2b6baaccaca285ab64ae.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13472bf0353e16784a22e1f890fba40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
2019-07-17更新
|
3783次组卷
|
8卷引用:甘肃省张掖市高台县第一中学2019-2020学年高二上学期期中考试文科数学试题
9-10高二下·广东佛山·期末
解题方法
4 . 若
,
,
,则
,
,
,
按由小到大的顺序排列为________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8610232c77741a37463feba1a66c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2122e3f1e76a635e58e4d54aa594c552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c6ce02259a85ea191541f4a708738f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a070d6518b58512d61fcb24e889a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8caa89771c07d316f6014baad12d9671.png)
您最近一年使用:0次