名校
解题方法
1 . (1)已知
、
、
、
是正实数,求证:
,当且仅当
时等号成立;
(2)求
的最小值,并指出取最小值时
的值.
![](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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29574517e0bd98aa055ee15120f8fff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfbd4e25575245b5688f4b6e395fcd1c.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fef9fd14d59c0e078198c430fb6e8bd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
您最近一年使用:0次
名校
2 . 在正方形
中,
分别是边
上的两个动点,且
,则
的取值范围是_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e02f58ebcf9978ea2082c2edec204fb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/481e426224c3a3ce9bb5a731eed81c40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/056c2272e0d10d6dd9706e6324d8e62d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3c34414e65788c8605c35890188248c.png)
您最近一年使用:0次
2020-01-11更新
|
307次组卷
|
2卷引用:2017年上海市浦东新区高三12月教学质量检测(一模)数学试题