已知函数f(x)=
.
(1)函数f(x)在区间(0,+∞)上是增函数还是减函数?证明你的结论;
(2)若当x>0时,f(x)>
恒成立,求正整数k的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce8282b86862bc20b47daef6ca1e81e.png)
(1)函数f(x)在区间(0,+∞)上是增函数还是减函数?证明你的结论;
(2)若当x>0时,f(x)>
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5c53d26c1399420975ebbcefb7fef2a.png)
21-22高三上·辽宁·期中 查看更多[2]
更新时间:2021-12-09 23:25:42
|
相似题推荐
解答题-证明题
|
适中
(0.65)
真题
【推荐1】已知函数
.
(I)讨论
的单调性;
(II)设
,证明:当
时,
;
(III)若函数
的图像与x轴交于A,B两点,线段AB中点的横坐标为x0,
证明:
(x0)<0.
![](https://img.xkw.com/dksih/QBM/2011/6/17/1570244935122944/1570244940554240/STEM/ef439e805eb34ad19b3813702475f953.png)
(I)讨论
![](https://img.xkw.com/dksih/QBM/2011/6/17/1570244935122944/1570244940554240/STEM/9bfcf520e0604e70b4b9da5c8e9a8c18.png)
(II)设
![](https://img.xkw.com/dksih/QBM/2011/6/17/1570244935122944/1570244940554240/STEM/7ab85e19634f4a79a3cefcb103f0f0da.png)
![](https://img.xkw.com/dksih/QBM/2011/6/17/1570244935122944/1570244940554240/STEM/ec5dcd1bb23940ff99d69d286eb7730b.png)
![](https://img.xkw.com/dksih/QBM/2011/6/17/1570244935122944/1570244940554240/STEM/305cbececb2543bf9f4322633f177df4.png)
(III)若函数
![](https://img.xkw.com/dksih/QBM/2011/6/17/1570244935122944/1570244940554240/STEM/75788716a75744bd9f094435dba9a9cb.png)
证明:
![](https://img.xkw.com/dksih/QBM/2011/6/17/1570244935122944/1570244940554240/STEM/9340c722d7eb44f19ae117b98be85ee1.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】已知函数
.
(1)判断函数
的单调性;
(2)证明:当x>0时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5caf6ebc5eb86142a69dddcb5bfd869.png)
(1)判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)证明:当x>0时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da26fbb28686b47778e62c79599f939.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】已知
,其中
图像在
处的切线平行于
轴
(1)确定
与
的关系
(2)设斜率为
的直线与
的图像交于
,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f27548c6ed4ad8abc4d3478b9497e9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad06867ffc465d38a92db29a0555d8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)确定
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)设斜率为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35115e581c859d8fd22653883ebd35ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bf8a2df76120058f84f6dce715247e0.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】已知实数
及函数
(1)若
,求
的单调区间;
(2)设集合
,使
在
上恒成立的
的取值范围记作集合
,求证:
是
的真子集.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96cbb495ca265f8c3db2b05df5c4ee41.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42c98250092857464fbe6cc0707b89ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)设集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83081fa919465e389c6c336e9a57d242.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b666663ce3537a634a3b427b418eb62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c188845ab3f8e26257664efff3f5bbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
您最近一年使用:0次