1 . 已知正实数a,b满足ab=1,则(a+1)(b+2)的最小值为________
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2 . 设函数
的最小值是
.
(1)求
的值;
(2)若
,是否存在正实数
,
满足
?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a93ba6d9e2baea731b99cbe4a3b69669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f35f52a876ae01a7fafd71c63f12834.png)
![](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/2d852a5b74f0f6eee26cd09341b3cb82.png)
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2017-05-31更新
|
521次组卷
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3卷引用:重庆市巴蜀中学2017届高三三诊考试文科数学试题
名校
3 . 已知函数
,
,
,则
的最小值等于__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18a14cf558775acdb5f8a2f1f0b4da68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f94345694d4215284c41f87146795ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8817eb77a192edb4f25df7033acb4606.png)
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2017-04-01更新
|
906次组卷
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2卷引用:2017届重庆市第一中学高三下学期第一次月考数学(文)试卷
名校
解题方法
4 . 已知正数
,
满足
,则
的最小值为_________ .
![](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/4a7dbc702617c765a573961953cc0901.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f91c35d0f2d1bb2ce74094aa52c74ac.png)
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2017-02-16更新
|
1685次组卷
|
3卷引用:重庆市实验中学校2020-2021学年高一上学期第二次阶段测验数学试题
5 . 已知
均为正数,且
,则
的最小值为()
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e748c1922a551b3776a324fa3ba8b0ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0fde4f8aa8e36636dd397384a1fe8da.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
6 . 已知
,当
取得最小值时,直线
与曲线
的交点的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05301f7d6982673bb852b82f42d84499.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1019d4ad2e3fb4a7abb66e0e9e55b556.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a227070f9d153c35eb0a2664e8fc2927.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d56ad3b9eb00038bf163609b0b69f8be.png)
A.1 | B.2 | C.3 | D.4 |
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真题
7 . 若
的最小值是
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571787056611328/1571787061755904/STEM/ae6570179fa246048ee9e925358eb86c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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