12-13高二上·湖南长沙·单元测试
1 . 已知函数
,
.
(1)记
,当
时,求函数
的单调递减区间;
(2)若对任意有意义的
,不等式
恒成立,求
的取值范围;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2deeb102a5c5073617c8d390f030fa77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9f049a5f960728c60a909821b2404b.png)
(1)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81ea1b627136b1694cf71930f5a4d9f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a813b5adbf5c7082561237894ba6d599.png)
(2)若对任意有意义的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4acda6b6464db27e1ec18a1522406d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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10-11高二下·云南红河·阶段练习
名校
2 . 已知函数f(x)=ln(x+1)-x.
⑴求函数f(x)的单调递减区间;
⑵若
,证明:
.
⑴求函数f(x)的单调递减区间;
⑵若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adc3e5be1796493161a4df7e28a6f6b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0cf3703d9267731e5e22e070edf696.png)
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