名校
解题方法
1 . 设全集
,集合
,非空集合
,其中
.
(1)若
,求
;
(2)从下列三个条件中任选一个作为已知条件,求
的取值范围.
①
,②
,③
的一个必要条件是
.
注:如果选择多个方案分别解答,按第一个方案解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dcaf41cda5c2df78a0ed2ac97277ceb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5bbcc194d7fded2796622c9fdfe99da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74e43b946a1ac8b13dc18eaaf854e27c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08290af79305df59bc0a1fc2b7c4f7c5.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd9ee4df3cd0c5982eec8be19e136130.png)
(2)从下列三个条件中任选一个作为已知条件,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e1454582a0ed30e5c758939309eb27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/545141a765a765791fb7cbedbcb7d827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23af61cd402b3789af2401bde9cbefe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cde2827722685b8a71f9aae2dc4d7484.png)
注:如果选择多个方案分别解答,按第一个方案解答计分.
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