1 . 已知两个不同的平面
和两条不重合的直线
,有下列四个说法:
(1)若
,则
;(2)若
,则
;
(3)若
,则
;(4)若
,则
.
其中正确说法的个数为________ 个.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9d2ca38e974e0f0d5592785fa3a680f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9c8210eadb24a76eccacaaff9ef9df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f5731edcee62ae3158bd4dbb9baedb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/202af51f5ebe87ec0017f439a6ad7fbf.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28ca0a81b673d2ef875648471b36d21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af680499446f4f2cd3c3d6cb37905efa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27dae831a26128497f805849449c0f24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb088614157a85ed7cb11802e49a2981.png)
其中正确说法的个数为
您最近一年使用:0次
解题方法
2 . 如图所示,已知三棱柱
中,若
是棱
的中点,在棱
上是否存在一点
使
平面
?并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f47d6a88e962cd790d2f159c021ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b7903de4be7d5dc1175cfbf6e8da9f.png)
![](https://img.xkw.com/dksih/QBM/2016/11/18/1579005317308416/1579005317939200/STEM/f407eed13de5401bb2963db997db5530.png)
您最近一年使用:0次
2016-12-13更新
|
741次组卷
|
3卷引用:北师大版 必修2 过关斩将 第一章 立体几何初步 §5 平行关系 5.1 平行关系的判定