名校
解题方法
1 . 如图所示,在直角梯形
中,
,
分别是
上的点,
且,
(如图1).将四边形
沿
折起,连接
,
,
(如图2).在折起的过程中,则下列表述:
①
平面
;
②四点B、C、E、F可能共面;
③
,则平面
平面
;
④平面
与平面
可能垂直.
其中正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/2cf008c7-3aba-484e-a800-d70e78e5f235.png?resizew=389)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787786e2f203f629ecfb9ec53814c1f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65436512ecbaefba4ac8123c55094211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26ca4c94b0eca19242a0de1005dda885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5f2275cfc3cc50b92b16288db72cfe0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8197bf06d017950c85c3ba6a291c095e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
②四点B、C、E、F可能共面;
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c1be2a5bfe8bab50cb68fe52d0f92ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9367449a5847eade07e69f4feddcb027.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
④平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
其中正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/2cf008c7-3aba-484e-a800-d70e78e5f235.png?resizew=389)
A.①④ | B.①③ | C.②③④ | D.①②④ |
您最近一年使用:0次
2020-11-09更新
|
1251次组卷
|
6卷引用:宁夏银川市2021届高三考前适应性训练(二)数学(文)试题
宁夏银川市2021届高三考前适应性训练(二)数学(文)试题(已下线)必刷卷05-2021年高考数学(理)考前信息必刷卷(新课标卷)(已下线)必刷卷01-2021年高考数学(文)考前信息必刷卷(新课标卷)四川省眉山市彭山区第一中学2021-2022学年高二上学期10月月考数学(文)试题内蒙古赤峰市松山区2020-2021学年高三第一次统一模拟考试理科数学试题(已下线)第28讲 直线与直线平行 2
名校
解题方法
2 . 如图,四棱锥
的底面
为平行四边形,
,
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/2020/7/17/2507695159894016/2507739473240064/STEM/9890999dde7e4eb2b831ea6290261b67.png?resizew=182)
(1)求证:
平面
.
(2)在线段
上是否存在一点
使得
,
,
,
四点共面?若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/2020/7/17/2507695159894016/2507739473240064/STEM/9890999dde7e4eb2b831ea6290261b67.png?resizew=182)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8298b274cf88d2fe96bfbb01e249282.png)
您最近一年使用:0次
2020-07-17更新
|
1274次组卷
|
2卷引用:宁夏青铜峡市高级中学2021-2022学年高二上学期期中考试数学(文)试题