若集合
,
,且“
”是“
”的充分不必要条件,则实数
的取值范围为________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9ba2ca3e37b8838437d85e9d327e194.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c0024ea88e4b906c30f572f6e987829.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed006b944ea64f970fee46e2f558467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23af61cd402b3789af2401bde9cbefe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
更新时间:2022-11-16 12:13:32
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容易
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【推荐1】已知
,
,若
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【推荐2】已知条件
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81c0d53834762454c7833f341e0d5228.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/583106105adb8eeb302949887a0c24d2.png)
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解题方法
【推荐2】设集合
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________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf7f33b963b8bf6424a2bae098193208.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4b9b470218359a4a47be9244980489e.png)
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