设集合
,若集合C = A
B,且C的子集有4个,则实数a的取值集合为______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce14d9e4a7bd7b0e200c2244bf1ac38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/321a57dd129e992d7834e91961987bd1.png)
更新时间:2022-08-19 14:05:56
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【推荐2】设集合
,集合
,若
中恰有2个元素,且定义
,则
的子集个数是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55117f9447dcc8bd0188b9deae550b88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eed1df466f4e1887cab89a6a490f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d52905e7fc697e3b5515e1023a14904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff5231cb0bfedf2f963c1830adfd74aa.png)
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解题方法
【推荐1】已知
,
或
.设
,若
,求实数a的取值范围_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e80506a4c1736a8a4c38529a9ca067f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f3a020df3fda19d59d1869deba74bc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18b00cafaea87cf835a3767edad0b861.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc0dc8098ad6f31bdd87771ca9cfa33a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0114f4d5ac5b631465e7490cf4912cc1.png)
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