名校
解题方法
1 . 已知函数
的导函数的图像如下图所示,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/1c91ab85-138e-480c-b1ae-228956326038.png?resizew=142)
①函数
在
上单调递增;
②函数
在
上单调递减;
③当
时,函数
取得极小值;
④当
时,函数
取得极大值.
则上述结论中,正确结论的序号为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/1c91ab85-138e-480c-b1ae-228956326038.png?resizew=142)
①函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1242ec96ac54e2fd418988d5190a88.png)
②函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870ebc2f7aabb028024894568d749934.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
则上述结论中,正确结论的序号为( )
A.①③ | B.②④ | C.①④ | D.②③ |
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