解题方法
1 . 已知函数
,关于x的方程
有以下结论:
①当
时,方程
在
最多有3个不等实根;
②当
时,方程
在
内有两个不等实根;
③若方程
在
内根的个数为偶数,则所有根之和为
;
④若方程
在
根的个数为偶数,则所有根之和为
.
其中所有正确结论的序号是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a97f268260e556e7142b2d30b91d18c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74f8452eaec2e2c3112c0a1f89a6742c.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3a34d6f60032718820c3da2b07786b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95cca1d1abf3b954a6f998199ca4c793.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e08265ce2ce53631ed29af6174de1dfe.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c4d0aca3657c6d99e820e2567f18683.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95cca1d1abf3b954a6f998199ca4c793.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e08265ce2ce53631ed29af6174de1dfe.png)
③若方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95cca1d1abf3b954a6f998199ca4c793.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/028f327307a1c307a8eaf03cb92cb391.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce7da0bd11533e2a6096272e372f467d.png)
④若方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95cca1d1abf3b954a6f998199ca4c793.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9e4ac19df66252e39e4b3e0e01f9552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc4d9a7c9b2ee0253a3a11d5117f9f49.png)
其中所有正确结论的序号是( )
A.②④ | B.①④ | C.①③ | D.①②③ |
您最近一年使用:0次