1 . 已知
,则
的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bd6047b670ad125d505010dd4576067.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e17b0033ec26789418ffe13fa677e0f6.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
解题方法
2 . 已知
,
,
.
(1)证明:
;
(2)求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20b8d3564d7ae5687f69b64b150c4b35.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39fdb217b0a881ece77d26efa9610a10.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a4a1a2a3a3b9d15539501245b48f889.png)
您最近一年使用:0次
2022-02-14更新
|
129次组卷
|
2卷引用:山西省吕梁市2022届高三上学期第一次模拟数学(文)试题
解题方法
3 . 今年情况特殊,小王在居家自我隔离时对周边的水产养殖产业进行了研究.
、
两个投资项目的利润率分别为投资变量
和
.根据市场分析,
和
的分布列分别为:
(1)若在
两个项目上各投资
万元,
和
分别表示投资项目
和
所获得的利润,求方差
,
;
(2)若在
两个项目上共投资
万元,那么如何分配,能使投资
项目所得利润的方差与投资
项目所得利润的方差的和最小,最小值是多少?
(注:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a829fdd8ec0f3b7ede883cf2c3e53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a829fdd8ec0f3b7ede883cf2c3e53b.png)
![]() | 5% | 10% |
![]() | 0.8 | 0.2 |
![]() | 2% | 8% | 12% |
![]() | 0.2 | 0.5 | 0.3 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c1116ce7f5a1a7b57517276d5092fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e006432be27a365b8ea6f1c4f835cbdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b4c6f25bc48add17c940a2a5b413bd1.png)
(2)若在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90dd550e1ad9bbf01687ffb4aab788ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(注:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65f6717b70ba30be5caf03e9674d1031.png)
您最近一年使用:0次
名校
4 . 函数
,
,若存在
,其中
且
,使得
,则
的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1be01f5cb16c638ab48e5180c684d5ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0e46a174b175635a6705a659d24730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1665e8d31a3727dd0208e3d5d4fb0a80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bc5735838e43b7a229e8f45c9bfffb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ad008bad51097c6109cad7c17c52e55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.8 | B.9 | C.10 | D.11 |
您最近一年使用:0次
2020-05-20更新
|
1116次组卷
|
4卷引用:2020届山西省晋中市高三下学期一模(普通招生考试模拟)数学(理)试题
2020届山西省晋中市高三下学期一模(普通招生考试模拟)数学(理)试题黑龙江省哈尔滨九中2021-2022学年高一上学期第一次验收数学试题(已下线)专题04 一元二次函数、方程与不等式常考压轴题型-2021-2022学年高一《新题速递·数学》(人教A版2019)黑龙江省哈尔滨市第九中学2021-2022学年高一上学期第一次阶段性验收测试数学试题
5 . 已知函数
,则函数
的最小值是____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e80ecf06978a584d8410e532c3a49835.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
您最近一年使用:0次