已知函数
是定义域为R的偶函数, 当
时,
,若关于x的方程
有且只有7个不同实数根,则a的取值范围是______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e77ef3594907760b08aadf98a9aed7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed527d8607a520170b5ad8e447b56aab.png)
更新时间:2016-12-04 05:40:49
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