名校
解题方法
1 . 正数
满足
,若不等式
恒成立,则实数
的取值范围__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60f2f31709757cff1c4e9275b7cfe4f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f8f0a937a720a18b043bc3652c41bab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
解题方法
2 . 已知函数
,有如下四个结论:
①函数
的图象关于点
对称;
②函数
的图象的一条对称轴为
;
③
,都有
,则
的最小值为
;
④
,使得
,则
的最大值为
.
其中所有正确结论的编号是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc08231f91064d4ece32bb3aec98887.png)
①函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7160d93f92089ef36f3dab809d3114b8.png)
②函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf764eb38d3c8508fe5c4e19633280c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6461468072bd27afd53fd5f9c3bf344.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c780149aef1bd77162e85f7f8906a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73f49d25be33228bc563d9069997147f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0c7a319f1fb9ef4cd6bd9eb5ab0c53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/710f135be44214b962d0936bfcda631e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
其中所有正确结论的编号是( )
A.①② | B.①③ | C.①④ | D.②③ |
您最近一年使用:0次