1 . 已知空间向量
,向量
,且
,则
不可能是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98444e95e7407511b788bb531f2c01d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a8d49bf33e578b25811e22e26dbf584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0705ffb6b3483a9ffdf2e67d8d3f6c97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f0043d442fc7bd9177c2e3716d3d762.png)
A.![]() | B.1 | C.![]() | D.4 |
您最近一年使用:0次
2023高三上·全国·专题练习
解题方法
2 . 已知
,
,求
的最值?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e64541d7f445079207b6f671adc7d662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04e3043955d94781eaabcc9a69a99c0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9a82da2f65af7cdabc1861ec3e68428.png)
您最近一年使用:0次
解题方法
3 . 已知函数
,若
恒成立,则
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f104e040357cc63280ea460e81744e96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/561480e3d3809613c33ce1f9c8890510.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
4 . 已知函数
.
(1)求
的值域;
(2)若
的最大值为
,正实数a,b,c满足
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e4492464fc79e5360f2b9eec031eede.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](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/80575fb0238c04a73edf1c4e24375206.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e3a93bba5d6d8b4279744c9a330b461.png)
您最近一年使用:0次
2023·全国·模拟预测
解题方法
5 . 已知a,b,c都是正实数.
(1)若
,求证:
;
(2)若
,求a+b+c的最小值.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ac3bc2d9585aeacc69ce70e31624f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d939ea6dd48e405968c9d79362716155.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38e4392332ef50858d2a95fc64bac5b0.png)
您最近一年使用:0次
解题方法
6 . 已知正实数a,b,c.
(1)若x,y,z是正实数,求证:
;
(2)求
的最小值.
(1)若x,y,z是正实数,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1daa0fd3371d6cfdeb3b4db57bef6964.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e02f8e60a1142f9ed71c6f502a736b0a.png)
您最近一年使用:0次
2023-05-12更新
|
414次组卷
|
3卷引用:专题14 不等式选讲
解题方法
7 . 设函数
,若关于
的方程
仅有两个不同的正实数根
,
.
(1)求
的取值范围;
(2)求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2627b158c8be1deb15234ada6ab82d1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9c0d827ef8598ba6b70b34b2bdcd1e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ebd22229a00d1ce90bc90e39572416c.png)
您最近一年使用:0次
2023-05-11更新
|
506次组卷
|
3卷引用:专题14 不等式选讲
名校
8 . 已知定义在R上的函数
的最小值为p.
(1)求p的值;
(2)设
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1d80ffd3879d8bb5e9c47c40843a0cd.png)
(1)求p的值;
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baca30d4248a82988890bd032d159b25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d834766c5df581256bb991812f32ed6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08a07f68b6ad8f8623a7ac2df6570159.png)
您最近一年使用:0次
2023-05-01更新
|
488次组卷
|
7卷引用:专题14 不等式选讲
名校
解题方法
9 . 已知函数
,不等式
的解集为
.
(1)求
的值;
(2)若三个实数
,
,
,满足
.证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a45b86bea4e48896e36ffbb7dce33d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4af81a7db1ca83f8ab738760e60759d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeabb54aee014be51ef627c14280e8a5.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若三个实数
![](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/d86be2de99fbf7f99cd54ab399146b00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49bd87f3684f72e8448221ea3e8a912f.png)
您最近一年使用:0次
2023-04-29更新
|
660次组卷
|
9卷引用:专题21不等式选讲
名校
10 . 已知
,且
,证明:
(1)
;
(2)若
,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1978a78e87d140abe13c7525b7eff29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3def64020286ee03384b45f103b9d6b6.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105d1fd8951d5b6d01874a742ae5cdcc.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b104867a12d24a353d94858c2fa17c8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62a68275289bc1667dfcc6a010aaa34d.png)
您最近一年使用:0次
2023-04-23更新
|
757次组卷
|
6卷引用:模块一 大招6 柯西不等式