1 . 已知
.
(1)当
为常数,且
在区间
变化时,求
的最小值
;
(2)证明:对任意的
,总存在
,使得
.
![](https://img.xkw.com/dksih/QBM/2017/1/4/1619442112995328/1619442113568768/STEM/ea3dce397360405f9e961222ddb1489e.png)
(1)当
![](https://img.xkw.com/dksih/QBM/2017/1/4/1619442112995328/1619442113568768/STEM/8980436897024d579315b0e8ae39cd84.png)
![](https://img.xkw.com/dksih/QBM/2017/1/4/1619442112995328/1619442113568768/STEM/388441b71b55412a82f00ea4c40a8bc2.png)
![](https://img.xkw.com/dksih/QBM/2017/1/4/1619442112995328/1619442113568768/STEM/8e5cc09bd9a24cc6b758c35524854b39.png)
![](https://img.xkw.com/dksih/QBM/2017/1/4/1619442112995328/1619442113568768/STEM/95aa0e237c814ae5ae9dc98d7342400d.png)
![](https://img.xkw.com/dksih/QBM/2017/1/4/1619442112995328/1619442113568768/STEM/623dbb39a2ba403c9ecef548a0d37aff.png)
(2)证明:对任意的
![](https://img.xkw.com/dksih/QBM/2017/1/4/1619442112995328/1619442113568768/STEM/ae008bc3e57648168291925414b216e0.png)
![](https://img.xkw.com/dksih/QBM/2017/1/4/1619442112995328/1619442113568768/STEM/7695f1e63dc94aa383d8bcd78ccf4903.png)
![](https://img.xkw.com/dksih/QBM/2017/1/4/1619442112995328/1619442113568768/STEM/b8c26e5f802541d19aff492aaa7567f1.png)
您最近一年使用:0次
名校
解题方法
2 . 已知函数
.
(1)若
,且
在
上单调递增,求实数
的取值范围;
(2)是否存在实数
,使得函数
在
上的最小值为1?若存在,求出实数
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c28a039ac30059ca1d1178b316653cab.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870ebc2f7aabb028024894568d749934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)是否存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870ebc2f7aabb028024894568d749934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
2017-02-08更新
|
884次组卷
|
5卷引用:2017届重庆市第一中学高三上期中数学(理)试卷
13-14高三上·重庆·期中
3 . 已知函数
.
(Ⅰ)若函数
在定义域内为增函数,求实数
的取值范围;
(Ⅱ)设
,若函数
存在两个零点
,且满足
,问:函数
在
处的切线能否平行于
轴?若能,求出该切线方程;若不能,请说明理由.
![](https://img.xkw.com/dksih/QBM/2013/3/19/1571152664150016/1571152669990912/STEM/7b3ab779c2a64798a7816b67cc8151de.png)
(Ⅰ)若函数
![](https://img.xkw.com/dksih/QBM/2013/3/19/1571152664150016/1571152669990912/STEM/f04ca06a29a044df951457b1c59e5486.png)
![](https://img.xkw.com/dksih/QBM/2013/3/19/1571152664150016/1571152669990912/STEM/4402ecdf2bd44065b6f451b0ab0cc032.png)
(Ⅱ)设
![](https://img.xkw.com/dksih/QBM/2013/3/19/1571152664150016/1571152669990912/STEM/85c2b43c6a274cdea7a3a1a065746418.png)
![](https://img.xkw.com/dksih/QBM/2013/3/19/1571152664150016/1571152669990912/STEM/53fd0f3ca4c543f98b91a203a3a7c847.png)
![](https://img.xkw.com/dksih/QBM/2013/3/19/1571152664150016/1571152669990912/STEM/d36afb58a5004efa97a91adeebe28eb4.png)
![](https://img.xkw.com/dksih/QBM/2013/3/19/1571152664150016/1571152669990912/STEM/a2ace2a629e541d7a642a9abbb8025fb.png)
![](https://img.xkw.com/dksih/QBM/2013/3/19/1571152664150016/1571152669990912/STEM/53fd0f3ca4c543f98b91a203a3a7c847.png)
![](https://img.xkw.com/dksih/QBM/2013/3/19/1571152664150016/1571152669990912/STEM/68214cc2d3ff4eaba7745bfb12e66ee2.png)
![](https://img.xkw.com/dksih/QBM/2013/3/19/1571152664150016/1571152669990912/STEM/cb276bb907184338b0fd9e8486dcba55.png)
您最近一年使用:0次