设有非空集合
,且当
时,必有
.则这样的集合
的个数是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8db918b875e3e032496562a80f9f59d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc020b0997a2f37b214718112b79d8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97e4abe3fd572e7f6e5e08fcd91436a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
2012高三·甘肃·竞赛 查看更多[1]
(已下线)2012年全国高中数学联赛甘肃赛区预赛试题
更新时间:2018-12-13 20:47:51
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【知识点】 集合的阶,集合之间的关系
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适中
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【推荐1】设
、
,且
,集合
,
,又
,则满足
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的个数是______ .
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适中
(0.65)
【推荐2】记
的解集为
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.已知
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