2020高三·浙江·专题练习
1 . 已知函数
,若函数
在开区间
上恒有最小值,则实数
的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42ec5ebdde0c32f22557d5fbb7c5195f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0c053877e0ea3bd5b8604dfc6d0f80c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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2019高一·浙江·专题练习
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2 . 已知函数
(
).
(1)当
时,求关于
的不等式
的解集;
(2)当
时,若不等式
对任意
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/966242cff7ffb57a408d2afb3d908586.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70e2a59609a05b0fc426843b4d283794.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d33da711e50e96568facb18cef27165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e279ff4d60f7d07dec30d6950e25e7.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/805130677f4e7ef19960218244e120a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/879dbe3c1e2d729ae8a8939e9d9f5025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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2019高一·浙江·专题练习
3 . 函数
的增区间是_______ ;
的最小值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1ec42b6a636faffef7329384e805443.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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4 . 已知函数f(x)=log2(x2+1),若对任意的x∈[0.2],不等式f(x2+2)≥f(2ax)恒成立,则实数a的取值范围是______ .
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