求证:四边形
是平行四边形的充要条件是四边形
的对角线
与
互相平分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2020/12/18/2616972205907968/2620256049577984/STEM/2492a82b8a5e4bb4826741be25d372f2.png?resizew=277)
20-21高一上·安徽六安·阶段练习 查看更多[3]
安徽省六安市霍邱县第一中学2020-2021学年高一上学期段考数学试题(已下线)第04讲 充分条件与必要条件(教师版)-【帮课堂】2021-2022学年高一数学同步精品讲义(人教A版2019必修第一册) (已下线)【一题多解】 图形性质 数以言之
更新时间:2020-12-23 10:27:29
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解答题-证明题
|
较易
(0.85)
解题方法
【推荐1】已知集合
.
(1)求证:
的充要条件是
;
(2)若
是
的充分不必要条件,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ea30f17181e16a52da2925d19b512d.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46a70d32c64918aa4d1d9d3ce0bdbf7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed006b944ea64f970fee46e2f558467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23af61cd402b3789af2401bde9cbefe.png)
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