1 . 若非空集合
,
,则能使
成立的所有
的集合是.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab61a1d7dc6336ac10a747a86a646725.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fca2526568c99b418dc8cfad1ba4b574.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee119ade13857c93a4709eb72874daf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2017-11-10更新
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4卷引用:1998年全国高中数学联合竞赛试题
A.![]() | B.![]() | C.![]() | D.![]() |